KR102358298B1 - Nano structure replica molding method of curved surface - Google Patents

Abstract

The present invention provides a replica molding method for a nanostructure on a curved surface. The replica molding method for a nanostructure on a curved surface according to the present invention comprises: a step for attaching one side of a film having a microstructure formed on the other side to an embossed curved surface of an embossed mold; a step for forming a first polymer on the embossed mold to which the film has been attached, and then curing the polymer; a step for forming an intaglio mold of a microstructure in which the microstructure has been replicated in reverse by removing the film from the first polymer which has been cured; a step for preparing a replicated film of a microstructure by interposing a second polymer between a curved body and the intaglio mold of a microstructure, and then curing the second polymer; and a step for forming a replicated curved body of a microstructure by forming the replicated film of a microstructure on the curved body.

Description

Nano structure replica molding method of curved surface

The present invention relates to a method for replicating a nanostructure on a curved surface, and it is possible to realize a curved surface molding having a nanostructure, which is not possible with the conventional planar molding method, with a relatively simple process, and to reproduce a nanostructure on a curved surface through an iterative process. It is about a method for replicating a nanostructure of a curved surface that can be formed.

Functional coating or functional structural coating is a method to improve aesthetics, heat resistance, light resistance, weather resistance, chemical resistance, waterproof, water repellency, antifouling, hydrophilicity, anti-fog, impact resistance, etc. It refers to a coating that is treated or adhered to further add or improve the quality of the surface as well as function.

In addition, eyeglass lenses, which are representative products in the field of living optics, camera lenses mounted on digital cameras or smartphones, and lenses for automobile cameras mounted on the rear, ADAS, autonomous driving cameras, etc. have recently required more advanced and differentiated functionality. The application of functional coatings to actively cope with the use environment such as bad weather is urgently required. In the case of the functional coating field of the lenses presented above, the annual domestic market is currently about 300 billion won and the global market is about 8 trillion won. It can be seen that there is a need for further improvement of the manufacturing method that provides functionality such as hydrophilic coating. However, since the surface of the lens has a predetermined curvature due to the characteristics of the lens, it is necessary to develop a coating or structural coating method different from planar molding.

Korea Patent Registration No. 10-1433090 (Registration Date: 2014.08.18.)

An object of the present invention is to provide a method for replicating a curved nanostructure capable of forming a nanostructure by molding and coating a nanostructure on the surface of a curved body having a predetermined curvature.

In addition, another technical problem to be achieved by the present invention is that it is possible to realize nanostructure curved surface molding, which is not possible with the conventional flat molding method, with a relatively simple process, and by repeatedly performing a curved surface that can reproduce the nanostructure on the curved surface again. An object of the present invention is to provide a method for replicating nanostructures of

Furthermore, another technical task to be achieved by the present invention is to provide a functional material having functions such as water repellency, antifouling and antifogging on the surface of a product having a curved surface such as a lens in the form of a nanostructure to maximize the functionality. An object of the present invention is to provide a molding method for replicating a curved nanostructure that can be molded and coated.

The object of the present invention is not limited to the object mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description.

In order to solve the above problems, the present invention comprises the steps of attaching the other side of the film having a microstructure formed on one side to the embossed curved surface of the embossed mold; forming and curing a first polymer on the embossed mold to which the film is attached; Separating and removing the film from the cured first polymer to form a microstructure intaglio mold in which the microstructure is replicated in reverse; Preparing a microstructure replica film by interposing a second polymer between the curved body and the microstructure intaglio mold and then curing; and forming the microstructure replica film on the curved body to form a microstructure replica curved body.

The curved body and the embossed curved surface of the embossed mold may have the same curvature.

The method for replicating the nanostructure of the curved surface may include: forming an intaglio mold on the curved body using the first polymer; and separating the curved body from the intaglio mold, filling the intaglio surface of the intaglio mold using the second polymer to form an embossed mold; This may include preparation.

The first polymer and the second polymer may have releasability after curing.

Attaching the other side of the film on which the microstructure is formed on one side to the curved surface of the embossed mold may be physically attached by selecting one of van der Waals bonding, plasma bonding, and corona bonding.

Attaching the other side of the film on which the microstructure is formed on one side to the curved surface of the embossed mold may be chemically attached by forming an adhesive or adhesive on the other side of the film.

The nanostructure replication molding method of a curved surface according to an embodiment of the present invention has an advantage in that the nanostructure can be formed by molding and coating the nanostructure on the surface of a curved body having a predetermined curvature.

In addition, it is possible to realize the nanostructure curved surface molding, which is not possible with the conventional planar molding method, with a relatively simple process, and there is an advantage in that the nanostructure can be reproduced and manufactured on the curved surface by repeatedly performing it.

Furthermore, a functional material having functions such as water repellency, antifouling, antifogging, etc. on the surface of a product having a curved surface such as a lens is molded in a nanostructure form to maximize its functionality and molded and coated. there are advantages to

1 is a process flow diagram showing a method for replicating a curved nanostructure according to an embodiment of the present invention;
2 to 8 are cross-sectional views showing a method for replicating a curved nanostructure according to an embodiment of the present invention;
9 is a photograph showing a film having a microstructure formed on one side;
10 is an enlarged photograph of an embossed mold and a microstructured film adhered to the curved surface of the embossed mold according to an embodiment of the present invention;
11 is an enlarged photograph of a microstructure engraved mold and a curved surface portion microstructure inverted phase structure according to an embodiment of the present invention;
12 is an enlarged photograph of a microstructure replicated curved body and a microstructure of a curved portion thereof according to an embodiment of the present invention;
13 is a photograph showing a lens molded and coated with a microstructure replica film according to an embodiment of the present invention;
14 shows a module in which a lens coated with a microstructure replica film according to an embodiment of the present invention is assembled into a camera barrel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the length, thickness, etc. of layers and regions may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

1 is a process flow chart showing a method for replica molding a curved surface according to an embodiment of the present invention, FIGS. 2 to 8 are cross-sectional views showing a method for replica molding a nanostructure of a curved surface according to an embodiment of the present invention, FIG. 9 is A photograph showing a film having a microstructure formed on one side, FIG. 10 is an enlarged photograph of an embossed mold according to an embodiment of the present invention and a microstructured film adhered to the curved surface of the embossed mold, FIG. 11 is an embodiment of the present invention An enlarged photograph of a microstructure intaglio mold and its curved microstructure inverted structure, FIG. 12 is an enlarged photograph of a microstructure replicating curved body and its curved microstructure according to an embodiment of the present invention, FIG. 13 is an embodiment of the present invention A photograph showing a lens coated with a microstructure replica film, FIG. 14 shows a module in which a lens coated with a microstructure replica film according to an embodiment of the present invention is assembled into a camera barrel.

1 to 14 , the method for replicating the nanostructure of a curved surface according to an embodiment of the present invention attaches the other side of the film 40 having a microstructure formed on one side to the embossed curved surface of the embossed mold 30 . step; forming and curing a first polymer (50a) on the embossed mold (30) to which the film (40) is attached; attaching the film 40 and the surface from the cured first polymer to the embossed curved surface of the embossed mold 30; Separating and removing the embossed mold 30 to which the film 40 is attached from the cured first polymer 50a to form a microstructure engraved mold 50 in which the microstructure is reproduced in reverse; manufacturing a microstructure replica film 60 by interposing a second polymer 60a between the curved body 10 and the microstructure engraved mold and then curing; and forming the microstructure replica film 60 on the curved body 10 to form a microstructure replica curved body.

In addition, by first preparing the embossed mold 30, forming the engraved mold 20 on the curved body 10 by using the first polymer (S120); and separating the curved body 10 from the intaglio mold 20, and using the second polymer to fill the intaglio surface of the intaglio mold 20 to form an embossed mold 30 (S130); including; and separating the intaglio mold 20 from the embossed mold 30 to prepare the embossed mold 30 .

In detail, first, the curved body 10 may be prepared ( S110 ). For example, the curved body 10 means an object in a range including products having a curved surface, such as spectacle lenses and camera lenses.

Next, an intaglio mold 20 may be formed on the curved body 10 using the first polymer (S120).

The first polymer may be a thermosetting or photocurable polymer.

For example, the first polymer may include a solution selected from a naturally curable polymer, an evaporation curable polymer, a thermosetting polymer, and a photocurable polymer, or a functional ceramic to a polymer selected from a naturally curable polymer, an evaporation curable polymer, a thermosetting polymer, and a photocurable polymer. , and may include a solution in which a solid component such as a metal is mixed.

Furthermore, as the first polymer, at least one selected from an acrylic polymer, a polyfunctional (meth)acrylate polymer, and an epoxy polymer may be used, and curing conditions of the first polymer may be selected according to a thermal initiator or a photoinitiator.

As the monomer of the acrylic resin, butyl acrylate, 2-ethylhexyl acrylate, acrylic acid, 2-hydroxyethyl (meth) acrylate, methyl (meth) acrylate, styrene monomer, glycidyl (meth) acrylate, At least one selected from the group consisting of isooctyl acrylate, stearyl methacrylate, dodecyl acrylate, decyl acrylate, vinyl acetate or acrylonitrile may be used. Polyfunctional urethane (meth) acrylate can be prepared by reacting (meth) acrylate having a hydroxyl group with trifunctional isocyanate. As trifunctional isocyanate, trifunctional isocyanate derived from hexamethylene diisocyanate, isophorone diisocyanate from At least one compound selected from the group consisting of derivatized trifunctional isocyanate or trimethane propanol adduct toluene diisocyanate may be used.

On the other hand, (meth) acrylate having a hydroxyl group is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate or caprolactone-modified hydroxy ( At least one selected from the group consisting of meth) acrylates may be used.

Epoxy polymers include bisphenol A type, bisphenol F type, bisphenol S type, brominated bisphenol A type, hydrogenated bisphenol A type, bisphenol AF type, biphenyl type, naphthalene type, fluorene type, phenol novolak type, orthocresol At least one selected from a bifunctional epoxy resin such as novolak type, trishydroxyphenylmethane type, tetraphenylolethane type, polyfunctional epoxy resin, trisglycidyl isocyanurate type, or glycidylamine type may be used can

Thermal initiators include dicumyl peroxide, t-butylcumyl peroxide, bis-(t-butyl-peroxy-isopropyl)benzene, di-t-butyl peroxide, 2,5-dimethylhexane-2,5- Organics such as dihydroperoxide, 2,5-dimethylhexyne-3,2,5-dihydroperoxide, dibenzoyl peroxide, bis-(2,4-dichlorobenzoyl)peroxide, and t-butyl perbenzoate Azo compounds such as peroxide, azo-bis-isobutyronitrile and azo-bis-cyclohexanenitrile, dimers such as dimercaptoethane, 1,6-dimercaptohexane, and 1,3,5-trimercaptotriazine At least one selected from the capto and polymercapto compounds may be used.

On the other hand, as a photoinitiator, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinepropanone-1, diphenylketone, benzyldimethylketal, 2-hydroxy-2-methyl-1-phenyl One -1-one, 4-hydroxy cyclo phenyl ketone may be used.

Next, separate the curved body 10 from the intaglio mold 20, and fill the intaglio surface of the intaglio mold 20 using a second polymer 30a to form the embossed mold 30 (S130) can And, by separating the intaglio mold 20 from the embossed mold 30, the embossed mold 30 can be prepared. That is, the first polymer and the second polymer may have releasability after curing, so that the embossed mold 30 and the engraved mold 20 can be easily separated. Further, before the second polymer 30a is filled on the intaglio surface of the intaglio mold 20, by applying a release agent to the intaglio surface of the intaglio mold 20, the embossed mold 30 and the intaglio mold 20 separation can be easily accomplished.

The second polymer may be a thermosetting or photocurable polymer.

For example, the second polymer may include a solution selected from a naturally curable polymer, an evaporation curable polymer, a thermosetting polymer, and a photocurable polymer, or a polymer selected from a naturally curable polymer, an evaporation curable polymer, a thermosetting polymer, and a photocurable polymer. Functional ceramics , and may include a solution in which a solid component such as a metal is mixed.

Furthermore, as the second polymer, at least one selected from an acrylic polymer, a polyfunctional (meth)acrylate polymer, and an epoxy polymer may be used, and curing conditions of the second polymer may be selected according to a thermal initiator or a photoinitiator.

As the monomer of the acrylic resin, butyl acrylate, 2-ethylhexyl acrylate, acrylic acid, 2-hydroxyethyl (meth) acrylate, methyl (meth) acrylate, styrene monomer, glycidyl (meth) acrylate, At least one selected from the group consisting of isooctyl acrylate, stearyl methacrylate, dodecyl acrylate, decyl acrylate, vinyl acetate or acrylonitrile may be used. Polyfunctional urethane (meth) acrylate can be prepared by reacting (meth) acrylate having a hydroxyl group with trifunctional isocyanate. As trifunctional isocyanate, trifunctional isocyanate derived from hexamethylene diisocyanate, isophorone diisocyanate from At least one compound selected from the group consisting of derivatized trifunctional isocyanate or trimethane propanol adduct toluene diisocyanate may be used.

On the other hand, (meth) acrylate having a hydroxyl group is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate or caprolactone-modified hydroxy ( At least one selected from the group consisting of meth) acrylates may be used.

Epoxy polymers include bisphenol A type, bisphenol F type, bisphenol S type, brominated bisphenol A type, hydrogenated bisphenol A type, bisphenol AF type, biphenyl type, naphthalene type, fluorene type, phenol novolak type, orthocresol At least one selected from a bifunctional epoxy resin such as novolak type, trishydroxyphenylmethane type, tetraphenylolethane type, polyfunctional epoxy resin, trisglycidyl isocyanurate type, or glycidylamine type may be used can

Thermal initiators include dicumyl peroxide, t-butylcumyl peroxide, bis-(t-butyl-peroxy-isopropyl)benzene, di-t-butyl peroxide, 2,5-dimethylhexane-2,5- Organics such as dihydroperoxide, 2,5-dimethylhexyne-3,2,5-dihydroperoxide, dibenzoyl peroxide, bis-(2,4-dichlorobenzoyl)peroxide, and t-butyl perbenzoate Azo compounds such as peroxide, azo-bis-isobutyronitrile and azo-bis-cyclohexanenitrile, dimers such as dimercaptoethane, 1,6-dimercaptohexane, and 1,3,5-trimercaptotriazine At least one selected from the capto and polymercapto compounds may be used.

On the other hand, as a photoinitiator, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinepropanone-1, diphenylketone, benzyldimethylketal, 2-hydroxy-2-methyl-1-phenyl One -1-one, 4-hydroxy cyclo phenyl ketone may be used

Next, the microstructure embossed mold can be formed by attaching the other side of the film 40 having a microstructure on one side thereof to the embossed curved surface of the embossed mold 30 as shown in FIG. 9 .

The microstructure may include a nanoscale structure, and may mean any range of microstructures that can be artificially formed, such as a synthesis method, an etching method, a laser processing, a semiconductor processing, and the like. That is, the film 40 on which the microstructure is formed may refer to a deformable thin film such as vinyl or wrap in which the microstructure is formed by using the above methods.

For example, attaching the other side of the film 40 having a microstructure formed on one side to the curved surface of the embossed mold 30 is physically attached by selecting one of van der Waals bonding, plasma bonding, and corona bonding. may be doing Furthermore, attaching the other side of the film 40 having a microstructure on one side to the curved surface of the embossed mold may be to form an adhesive or a pressure-sensitive adhesive on the other side of the film to chemically attach it, and the physical attachment Adhesion between the microstructured film 40 and the embossed mold 30 can be reinforced by applying a combination of chemical and chemical adhesion. And, the step of cutting the film 40 on which the microstructure is formed to fit the area of the upper part of the embossed mold 30 may be further included.

10 is an enlarged photograph (b) of the embossed mold 30 and the microstructured film 40 adhered to the curved portion of the embossed mold according to an embodiment of the present invention. The surface of the microstructured embossed mold formed in the same way as above. can confirm.

Next, as shown in FIG. 6a, after forming and curing the first polymer 50a on the embossed mold 30 to which the film 40 is attached, that is, the microstructure embossed mold as shown in FIG. 9, as shown in FIG. 6b By separating and removing the film 40 from the cured first polymer, it is possible to form a microstructure intaglio mold 50 in which the microstructure is reproduced in reverse (S150).

11 is an enlarged photograph (d) of the microstructure intaglio mold 50, a and the inverted microstructure of the curved surface portion according to an embodiment of the present invention, confirming the microstructure formed in the reverse phase on the surface of the intaglio mold 50 can

Next, the second polymer 60a is interposed between the curved body 10 and the microstructure engraved mold 50 and cured to prepare a microstructure replica film 60 (S160). The microstructure intaglio mold 50 and the microstructure replica film by manufacturing the microstructure replica film 60 using the microstructure intaglio mold 50 formed of the first polymer 50a and the second polymer 60a having releasability Separation of (60) can be made easily. In addition, for example, in manufacturing (S160) of the microstructure replica film 60, after applying a release agent on the intaglio surface 55 of the microstructure intaglio mold 50, the second polymer (60a) It may include interposing a, whereby the separation of the microstructure engraved mold 50 and the microstructure replica film 60 can be further facilitated.

In this case, the second polymer 60a may include a functional material having functions such as water repellency, antifouling, and antifogging on the surface of the curved body.

In addition, there is an advantage in that the microstructure replica film 60 can be reproduced by using the microstructure intaglio mold 50 and repeatedly performing a curing process by applying a necessary functional material.

Finally, the microstructure replica film 60 may be formed on the curved body 10 to form a microstructure replica curved body (S170).

Forming (S170) of the microstructure replica film 60 on the curved body 10 may be selecting one of van der Waals bonding, plasma bonding, and corona bonding and physically attaching it. Furthermore, the formation (S170) of the microstructure replica film 60 on the curved body 10 may be to form an adhesive or an adhesive on the other side of the microstructure replica film 60 and chemically attach it. , it is possible to reinforce the adhesion between the microstructure replica film 60 and the curved body 10 by applying a combination of the physical and chemical adhesion.

12 is an enlarged photograph (b) of a microstructure-replicated curved body (a) and a microstructure of a curved portion thereof according to an embodiment of the present invention, in which it can be seen that the microstructure is replicated on the curved body. For example, when a microstructure replica is applied to a camera lens, a water repellent, antifouling, or hydrophilic (anti-fogging) functional material on the curved surface of the lens is applied to the microstructure replica film 60 to maximize its functionality. can be mold coated.

13 is a photograph showing a lens molded and coated with a microstructure replica film according to an embodiment of the present invention, (a) is a water repellent (antifouling) functional material on the curved surface of the camera lens as a microstructure replica film 60 This is a photograph showing a camera lens to which a microstructure replicating curved body is formed and applied, (b) is a camera to which a microstructure replicating curved body is applied by forming a hydrophilic (anti-fogging) functional material on the curved surface of the camera lens with a microstructure replicating film 60 This is a picture of the lens.

In addition, in the case of Fig. 14, it shows a module in which a lens coated with a molded coating of a microstructure replica film according to an embodiment of the present invention is assembled into a camera barrel. It shows that it is applied as a replica film 60 and manufactured as a camera barrel using a molded-coated lens.

The method for replicating a curved nanostructure according to an embodiment of the present invention has the advantage of forming a nanostructure by molding and coating the nanostructure on the surface of a curved body having a predetermined curvature using a curable polymer. In addition, it is possible to realize the nanostructure curved surface molding, which is not possible with the conventional planar molding method, with a relatively simple process, and has the advantage of being able to reproduce the nanostructure on the curved surface again by repeatedly performing it. Furthermore, a functional material having functions such as water repellency, antifouling, antifogging, etc. on the surface of a product having a curved surface such as a lens is molded in a nanostructure form to maximize its functionality and molded and coated. there are advantages to

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as described in the claims below. You will understand that it can be done.

10; curved body
20; engraved mold
30a, 60a; second polymer
30; embossed mold
40; Film with microstructure
50a; first polymer
50; microstructure engraved mold
60; Microstructure replica film

Claims (6)

attaching the other side of the film having a microstructure formed on one side to the embossed curved surface of the embossed mold;
forming and curing a first polymer on the embossed mold to which the film is attached;
Separating and removing the film from the cured first polymer to form a microstructure intaglio mold in which the microstructure is replicated in reverse;
Preparing a microstructure replica film by interposing a second polymer between the curved body and the microstructure intaglio mold and then curing; and
Forming the microstructure replica film on the curved body to form a microstructure replica curved body,
forming an intaglio mold on the curved body using the first polymer; and
Separating the curved body from the intaglio mold, using the second polymer to fill the intaglio surface of the intaglio mold to form an embossed mold;
A method for replicating a curved nanostructure, comprising preparing an embossed mold by separating the engraved mold from the embossed mold.
The method of claim 1,
Nanostructure replica molding method of a curved surface, characterized in that the curved body and the embossed curved surface of the embossed mold have the same curvature.
delete The method of claim 1,
The first polymer and the second polymer are curved nanostructure replication molding method, characterized in that it has releasability after curing.
The method of claim 1,
Attaching the other side of the film on which the microstructure is formed on one side to the curved surface of the embossed mold selects one of van der Waals bonding, plasma bonding, and corona bonding and physically attaches it to the curved surface of the nanostructure replication molding method.
The method of claim 1,
Attaching the other side of the film having a microstructure on one side to the curved surface of the embossed mold is a method of replicating a curved surface, characterized in that it is chemically attached by forming an adhesive or adhesive on the other side of the film.

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