KR102113225B1 - smart window film and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a smart window film and a method for manufacturing the same, and more specifically, it has a thinner thickness than a conventional smart window film, and can not only save construction cost, but also has low solar heat acquisition rate and emissivity to save cooling and heating costs. It relates to a smart window film and a method of manufacturing the same.

Description

Smart window film and its manufacturing method {smart window film and manufacturing method thereof}

The present invention relates to a smart window film and a method for manufacturing the same, and more specifically, it has a thinner thickness than a conventional smart window film, and can not only save construction cost, but also has low solar heat acquisition rate and emissivity, thereby saving cooling and heating costs. It relates to a smart window film and a method of manufacturing the same.

Recently, as interest in resource depletion problems and quality of life increases, energy saving effect, eco-friendliness, and convenience are important topics. To meet this, energy efficiency is increased through active transmittance adjustment and infrared blocking effect, and sensitivity and functionality Attention is paid to smart window technology that satisfies the back simultaneously.

In general, smart windows (smart windows) are formed to be turned on and off, and when a voltage is applied, it means a window in which the amount of light or heat passing through is controlled by changing the transmittance of light. That is, the smart window is provided to be changed into a transparent, opaque, or translucent state by voltage, and is also called a variable transmittance glass, dimming glass, or smart glass.

In addition, smart windows can be used as partitions in indoor spaces or as skylights placed in openings of buildings, and can also be used as highway signs, bulletin boards, scoreboards, clocks, or advertising screens. It can also be used as a ship or train window or sunroof.

A representative example of such a smart window is a polymer-dispersed liquid crystal-based smart window.

A polymer-dispersed liquid crystal (PDLC) -based smart window is a form in which liquid crystal droplets are dispersed in a polymer adhesive (binder). In an off-state, light is scattered due to a difference in refractive index between the polymer and the dispersed liquid crystal. In the case of (On state), the refractive index of the dispersed liquid crystal changes, and the refractive indexes of the two materials coincide, indicating a smart window that is transparent.

On the other hand, in applying the smart window technology, in recent years, as interest in the environment and energy has increased, the demand for energy-saving industrial products has increased, and as one of them, heat shielding of shielding members such as houses, buildings, automobiles, and glass, That is, there is a need for a glass or film that is effective in reducing the heat load from sunlight. Typically, in the case of buildings, the cause of over 35% of building energy loss is the window performance of the building, and if the window performance decreases, the cooling and heating air-conditioning efficiency of the building may decrease as well.

Accordingly, the development of a smart window film that can reduce cooling and / or heating costs due to low solar heat acquisition and emissivity is an urgent situation.

Korean Registered Patent No. 10-1335663 (Publication date: 2013.05.27)

The present invention has been devised in view of the above points, and has a thinner thickness than a conventional smart window film, and can not only save construction cost, but also have a low solar heat acquisition rate and emissivity, thereby saving cooling and heating costs. It is an object to provide a film and a manufacturing method thereof.

In addition, an object of the present invention is to provide a smart window film having less weather-resistant color difference, heat permeability and haze, and a method for manufacturing the same.

In order to solve the above problems, the smart window film of the present invention is a reflective film portion and a first electrode layer in which a reflective film base layer, a first metal oxide layer, a reflective metal layer, a second metal oxide layer and a transparent protective layer are sequentially stacked. , A liquid crystal layer, a second electrode layer, a liquid crystal film base layer and a pressure-sensitive adhesive layer sequentially comprising a liquid crystal film portion, the reflective film portion of the reflective film base layer, the first electrode layer of the liquid crystal film portion may be laminated.

In a preferred embodiment of the present invention, the smart window film of the present invention may have a thickness of 100 ~ 400㎛.

In a preferred embodiment of the present invention, the reflective film portion and the liquid crystal film portion may have a thickness ratio of 1: 1.41 to 4.16.

In one preferred embodiment of the present invention, the reflective film base layer of the present invention may be in physical contact with the first metal oxide layer and the first electrode layer.

In a preferred embodiment of the present invention, the first metal oxide layer and the second metal oxide layer each have a thickness of 15 to 50 nm, the reflective metal layer has a thickness of 5 to 25 nm, the following conditions (1) and (2) can all be satisfied.

(One)

(2)

In the above conditions (1) and (2), a is the thickness of the first metal oxide layer, b is the thickness of the second metal oxide layer, and c is the thickness of the reflective metal layer.

In a preferred embodiment of the present invention, the reflective film base layer may have a thickness of 10 ~ 100㎛.

In a preferred embodiment of the present invention, the liquid crystal film base layer may have a thickness of 10 ~ 190㎛.

In a preferred embodiment of the present invention, the transparent protective layer may have a thickness of 0.5 ~ 2.5㎛.

In a preferred embodiment of the present invention, the first electrode layer and the second electrode layer may each have a thickness of 15 to 40 nm.

In a preferred embodiment of the present invention, the liquid crystal layer may have a thickness of 5 ~ 35㎛.

In one preferred embodiment of the present invention, the pressure-sensitive adhesive layer may have a thickness of 10 ~ 30㎛.

In one preferred embodiment of the present invention, the transparent protective layer may include a copolymer of urethane acrylate, epoxy-modified acrylate, and acrylic resin.

In a preferred embodiment of the present invention, the copolymer is a urethane acrylate, an epoxy-modified acrylate and an acrylic resin copolymerized at a weight ratio of 1: 0.2 to 3.5: 0.05 to 2.5, and the weight average molecular weight is 800 to 15,000, The acid value may be 12 or less, and the amine value may be 7 or less.

In one preferred embodiment of the present invention, the first metal oxide layer and the second metal oxide layer each include zinc oxide (ZnO) of 25 to 45% by weight and tin oxide (SnO ₂ ) of zinc tin containing 55 to 75% by weight It may include oxide (Zinc Tin Oxide, ZTO).

In one preferred embodiment of the invention, the reflective metal layer may include a silver-palladium-copper alloy (Ag-Pd-Cu alloy, APC).

In a preferred embodiment of the present invention, the reflective film base layer and the liquid crystal film base layer may each include at least one selected from glass and PET (Polyethylene terephthalate).

In a preferred embodiment of the present invention, the first electrode layer and the second electrode layer may each include at least one selected from indium tin oxide (ITO) and a conductive polymer.

In one preferred embodiment of the present invention, the liquid crystal layer may include a liquid crystal and a polymer matrix.

In one preferred embodiment of the present invention, the pressure-sensitive adhesive layer may include at least one selected from resins including polyester resins, urethane resins, acrylic resins, silicone resins, and derivatives thereof.

In a preferred embodiment of the present invention, the first electrode layer and the second electrode layer may each have a sheet resistance of 30 to 200 Pa / □.

In a preferred embodiment of the present invention, the smart window film of the present invention may have a solar heat gain coefficient (SHGC, Solar Heat Gain Coefficient) of 0.5% or less.

In a preferred embodiment of the present invention, the smart window film of the present invention may have an emissivity of 0.3 or less.

On the other hand, the manufacturing method of the smart window film of the present invention includes a first film portion in which a first electrode layer is deposited on one surface of a reflective film base layer of a reflective film portion, a second film portion in which a second electrode layer is deposited on one surface of a liquid crystal film base layer, and a liquid crystal. A first step of preparing a layer, a second step of laminating such that a liquid crystal layer is positioned between the first film portion and the second film portion, and then curing to produce a third film portion and the liquid crystal of the third film portion A third step of manufacturing a smart window film by forming an adhesive layer on one side of the film base layer may be included.

In a preferred embodiment of the present invention, the second step is a second-first step, the first and second film portions are positioned such that the first electrode layer of the first film portion and the second electrode layer of the second film portion face each other. It may include a 2-2 step in which a liquid crystal layer is positioned between the 2nd step and a 2-3 step in which the first and second film portions are lined to cure.

In a preferred embodiment of the present invention, the first film portion is a first metal oxide layer on one surface of the reflective film base layer by a sputtering process, a reflective metal layer on one surface of the first metal oxide layer, and a surface of the reflective metal layer. 2 A metal oxide layer, the 1-1 step of sequentially depositing a first electrode layer on the other side of the reflective film base layer and a transparent protective layer forming composition on one surface of the second metal oxide layer, and cured to form a transparent protective layer It can be manufactured through steps 1-2.

In one preferred embodiment of the present invention, the transparent protective layer forming composition comprises a copolymer forming composition and a solvent comprising urethane acrylate, epoxy-modified acrylate, and acrylic resin, and the solvent is methyl isobutyl ketone (MIBK ), Methyl ethyl ketone (MEK), ethyl acetate, methyl acetate, butyl acetate, xylene, acetic acid, ethyl alcohol, methyl alcohol, butyl alcohol and isopropyl alcohol.

In a preferred embodiment of the present invention, it may include 40 to 85 parts by weight of a solvent with respect to 100 parts by weight of the copolymer-forming composition.

Furthermore, the manufacturing method of the smart window film of the present invention includes (1) a first film portion in which a first electrode layer is deposited on one surface of a reflective film base layer of a reflective film portion, and a second electrode layer is deposited on one surface of a liquid crystal film base layer and a liquid crystal film base material. Preparing a second film portion and a liquid crystal layer on which the pressure-sensitive adhesive layer is deposited on the other surface of the layer, and (2) laminating such that a liquid crystal layer is positioned between the first film portion and the second film portion, and curing the smart film. And manufacturing a window film.

The smart window film of the present invention and a method for manufacturing the same have a thinner thickness than a conventional smart window film, thereby saving construction cost.

In addition, the smart window film and its manufacturing method of the present invention have excellent solar-heating energy saving characteristics due to low solar heat acquisition rate and emissivity.

In addition, the smart window film of the present invention and a method for manufacturing the same have few weather-resistant color difference changes, and are excellent in durability, heat insulation performance, and strength.

1 is a cross-sectional view of a smart window film according to an exemplary embodiment of the present invention.
Figure 2 is a process diagram showing the first-first step in manufacturing a first film portion according to an embodiment of the present invention.
Figure 3 is a process diagram showing the first and second steps in manufacturing a first film portion according to a preferred embodiment of the present invention.
Figure 4 is a process diagram showing a process for manufacturing a second film portion according to an embodiment of the present invention.
5 and 6 is a process diagram showing a second step of the manufacturing method of a smart window film according to an embodiment of the present invention.
7 is a process diagram showing a third step of the manufacturing method of a smart window film according to an exemplary embodiment of the present invention.
8 is a cross-sectional view of the smart window film prepared in Comparative Examples 1 to 3.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar elements throughout the specification.

Referring to Figure 1, the smart window film of the present invention includes a reflective film portion and a liquid crystal film portion.

First, the reflective film part of the present invention is a part capable of reflecting infrared rays, and is included in the configuration of the smart window film of the present invention to lower the solar heat acquisition rate and emissivity. Further, the change in weather-resistant color difference can be reduced, and durability, heat insulation performance and strength can be increased.

In addition, the liquid crystal film portion of the present invention is a part capable of variably controlling the light transmittance of the smart window film by applying external stimuli such as voltage, heat, light, etc., and may have high transmittance, low sheet resistance, and fast response speed.

The reflective film portion and the liquid crystal film portion of the present invention may have a thickness ratio of 1: 1.41 to 4.16, preferably a thickness ratio of 1: 1.58 to 1.95, more preferably a thickness ratio of 1: 1.67 to 1.86, and if the thickness ratio is 1 : If less than 1.41, when manufacturing the reflective film base layer of the reflective film part and the first electrode layer or the second electrode layer of the liquid crystal film part, there may be a problem of thermal deformation in the sputtering process. There may be a defect in tearing due to a difference in tension between the film portion and the liquid crystal film portion.

On the other hand, the smart window film of the present invention may have a thinner thickness than the conventional smart window film, it has the advantage of saving the construction cost by having such a thin thickness. Specifically, the smart window film of the present invention may have a thickness of 100 to 400 μm, preferably a thickness of 120 to 160 μm, more preferably a thickness of 130 to 150 μm, and specifically, the smart window of the present invention The film may have a thickness of 100 to 400 μm, preferably a thickness of 100 to 200 μm, more preferably a thickness of 100 to 150 μm, and if the thickness is less than 100 μm, the product may be thermally deformed when manufacturing a double-sided substrate. Production may not be possible, and if the thickness exceeds 480㎛, there may be a problem of long construction time with the same thickness as a conventional smart window film.

Next, when specifically describing the reflective film portion of the present invention, the reflective film portion is a reflective film base layer 50, a first metal oxide layer 40, a reflective metal layer 30, a second metal oxide layer 20 and transparent The protective layer 10 may be sequentially stacked.

At this time, the reflective film portion may be a first metal oxide layer 40 on one surface of the reflective film base layer 50 by a sputtering (Sputtering) process, one surface of the first metal oxide layer 40 by the sputtering (Sputtering) process The reflective metal layer 30 may be stacked on the second metal oxide layer 20 on one surface of the reflective metal layer 30 by a sputtering process.

First, the transparent protective layer 10 of the present invention serves to protect the smart window film of the present invention, particularly the first metal oxide layer 40, the reflective metal layer 30 and the second metal oxide layer 20, A layer that performs a function of significantly improving emissivity and durability, and may have a thickness of 0.5 to 2.5 μm, preferably a thickness of 0.96 to 1.44 μm, and more preferably a thickness of 1.08 to 1.32 μm. If the thickness of the transparent protective layer 10 is less than 0.5 μm, the durability and surface durability of the emissivity may deteriorate, and the color difference change of weatherability may increase, and if the thickness exceeds 2.5 μm, the emissivity may increase. have.

In addition, the transparent protective layer 10 of the present invention may include a copolymer of urethane acrylate, epoxy-modified acrylate, and acrylic resin. At this time, the urethane acrylate and the epoxy-modified acrylate may be oligomers or resins, preferably oligomers.

Specifically, the transparent protective layer 10 of the present invention is urethane acrylate, epoxy-modified acrylate and acrylic resin in a weight ratio of 1: 0.2 to 3.5: 0.05 to 2.5, preferably 1: 0.3 to 3: 0.06 to 2 It may include a copolymer copolymerized in a weight ratio of. At this time, when the weight ratio of the urethane acrylate and the epoxy-modified acrylate is less than 1: 0.2, the surface hardness may be lowered, which may cause scratching during the construction of the smart window film. When the weight ratio exceeds 1: 2.5, the smart window of the present invention The flexibility of the film is lowered and cracks may occur on the surface. In addition, if the weight ratio of the urethane acrylate and the acrylic resin is less than 1: 0.05, the degree of crosslinking may be lowered and sufficient curing may not be achieved, and there may be a problem that the desired hardness cannot be reached, and if the weight ratio exceeds 1: 2.5, the degree of crosslinking May rise and cracks may occur on the surface.

In addition, the copolymer that may be included in the transparent protective layer 10 of the present invention may have a weight average molecular weight of 800 to 15,000, and preferably 1,000 to 10,000. If the weight average molecular weight is less than 800, the transparent protective layer 10 becomes too hard and cracks may occur, and if the weight average molecular weight exceeds 15,000, sufficient crosslinking does not occur and there may be a problem that complete curing does not occur.

In addition, the copolymer that may be included in the transparent protective layer 10 of the present invention has an acid value of 12 or less, preferably an acid value of 10 or less, an amine value of 7 or less, and preferably an amine value of 5 or less. have. If the acid value exceeds 12, there may be a problem of a decrease in durability and a change in weather-resistant color difference due to a radical reaction by light on a metal surface, and a problem of yellowing due to ultraviolet rays when the amine value exceeds 7 .

Next, each of the first metal oxide layer 40 and the second metal oxide layer 20 of the present invention exhibits excellent emissivity, durability, transmittance, and heat insulation performance, prevents weather-resistant color difference, and reflects the metal layer 30. As to perform a function of protecting, it may include without limitation any metal oxide that can be used in the art, preferably, Zinc Tin Oxide (ZTO), and more preferably , With respect to the total weight, zinc oxide (ZnO) 25 to 45% by weight and tin oxide (SnO ₂ ) may include zinc tin oxide containing 55 to 75% by weight. If the weight percent of zinc oxide (ZnO) is less than the range, and the weight percent of the tin oxide exceeds the range, durability may deteriorate, and the weight percent of the zinc oxide exceeds the range and the weight percent of the tin oxide is less than the range. If it is, the insulation performance may deteriorate.

In addition, each of the first metal oxide layer 40 and the second metal oxide layer 20 of the present invention may have a thickness of 15 to 50 nm, preferably 25 to 45 nm, more preferably 30 to 40 nm, If the thickness is less than 15 nm, the reflective metal layer 30, which will be described later, may not be protected, emissivity and weathering color difference change may increase, durability may be deteriorated, and when the thickness exceeds 50 nm, thermal insulation may occur due to an increase in emissivity. Performance may be degraded.

Next, the reflective metal layer 30 of the present invention may include, without limitation, any material that can be commonly used in the reflective metal layer in the art, preferably silver-palladium-copper alloy (Ag-Pd-Cu alloy, APC) ).

In addition, the reflective metal layer 30 of the present invention may have a thickness of 5 to 25 nm, preferably 12 to 18 nm, more preferably 13.5 to 16.5, and if the thickness is less than 5 nm, the thermal insulation performance decreases, The solar heat acquisition rate may be increased, and when the thickness exceeds 25 nm, the visible light transmittance may be lowered and the reflectance of the smart window film may be significantly increased.

Next, the first metal oxide layer 40, the reflective metal layer 30 and the second metal oxide layer 20 of the present invention may satisfy both of the following conditions (1) and (2).

, 바람직하게는

, 더욱 바람직하게는

(One)

, Preferably

, More preferably

, 바람직하게는

, 더욱 바람직하게는

(2)

, Preferably

, More preferably

In the above conditions (1) and (2), a is the thickness of the first metal oxide layer 40, b is the thickness of the second metal oxide layer 20, c is the thickness of the reflective metal layer 30.

This may have poor insulation performance when the thickness of the reflective metal layer 30 is thin, and may have a problem that the indoor temperature increases due to a high solar heat acquisition rate, and when the thickness is thick, the visible light transmittance decreases and the reflectivity of the smart window film is remarkable. Can be elevated. In addition, when the thickness of the first and second metal oxide layers 20 and 40 is thin, the reflective metal layer 30 may not be protected, durability may be deteriorated, and when the thickness is thick, the emissivity is high and the insulation performance is high. There may be a problem of deterioration.

Therefore, the first metal oxide layer 40, the reflective metal layer 30, and the second metal oxide layer 20 that may be included in the smart window film should exhibit appropriate thicknesses, and the conditions (1) and (2) All are satisfied, and the problem mentioned above can be solved.

이 21 미만이면 내구성 및 단열성능이 좋지 않을 수 있고, 방사율 및 내후성 색차변화가 증가할 수 있으며, 태양열 차단 성능이 저하되어 태양열 취득율이 상승하는 문제가 있을 수 있다. 또한, 만일 상기 조건 (2)에서

가 1.0 미만이면 내구성이 저하될 수 있고, 내후성 색차변화가 증가할 수 있으며, 가시광선 투과율이 낮아지고 스마트 윈도우 필름의 반사율이 현저히 높아질 수 있다.If, in the condition (1) above

If it is less than 21, durability and heat insulation performance may not be good, emissivity and weather-resistant color difference change may increase, and there may be a problem that a solar heat acquisition rate is increased due to a decrease in solar heat blocking performance. Also, if the condition (2) above

If it is less than 1.0, durability may be deteriorated, weather-resistant color difference change may increase, visible light transmittance may be lowered, and reflectance of a smart window film may be significantly increased.

Next, the reflective film base layer 50 of the present invention serves as a supporting layer of the reflective film part, and may be included without limitation as long as it is a material commonly used in the art, preferably glass and PET (Polyethylene terephthalate) ), And more preferably, plasma or corona-treated PET.

In addition, the reflective film base layer 50 of the present invention may have a thickness of 10 ~ 100㎛, preferably a thickness of 40 ~ 60㎛, more preferably 45 ~ 55㎛, if the thickness is 10㎛ If less than, in manufacturing a smart window film, it may cause deformation of the substrate due to heat generated during drying and curing, and may cause a problem of tearing due to tension applied to the substrate during the roll-to-roll process. In addition, if the thickness exceeds 100 μm, there may be a problem of an increase in raw material cost and a shorter length that can be wound on one roll, resulting in an increase in process time due to an increase in roll replacement time.

 Next, when the liquid crystal film portion of the present invention is specifically described, the liquid crystal film portion includes a first electrode layer 60, a liquid crystal layer 70, a second electrode layer 80, a liquid crystal film base layer 90, and an adhesive layer 100. These can be stacked sequentially. At this time, the first electrode layer 60 of the liquid crystal film portion may be stacked on one surface of the reflective film base layer 50 of the reflective film portion. In other words, the smart window film of the present invention includes a transparent protective layer 10, a second metal oxide layer 20, a reflective metal layer 30, a first metal oxide layer 40, a reflective film base layer 50, and The first electrode layer 60, the liquid crystal layer 70, the second electrode layer 80, the liquid crystal film base layer 90, and the pressure-sensitive adhesive layer 100 may have a stacked structure.

In addition, the first electrode layer 60 of the liquid crystal film portion may be stacked on one surface of the reflective film base layer 50 of the reflective film portion by a sputtering process. In addition, the reflective film base layer 50 may be in physical contact with the first metal oxide layer 40 and the first electrode layer 60.

First, driving power is applied to the first electrode layer 60 and the second electrode layer 70 of the present invention, and serves to supply the applied driving power to the liquid crystal layer 70. The first electrode layer 60 and the second electrode layer 70 of the present invention may each include one or more selected from various metals, metal oxides, and conductive polymers having conductivity, preferably zinc tin compound (indium tin oxide) , ITO) and a conductive polymer, and more preferably, a zinc tin compound (ITO).

In addition, the first electrode layer 60 and the second electrode layer 70 of the present invention may each have a thickness of 15 to 40 nm, preferably a thickness of 20 to 30 nm, more preferably 22.5 to 27.5 nm, If the thickness is less than 15 nm, there may be a problem that the reaction rate is lowered due to high resistance, and if it exceeds 40 nm, the transmittance of the substrate may be lowered, and thus there may be a problem of visibility.

In addition, the first electrode layer 60 and the second electrode layer 70 of the present invention have a sheet resistance of 30 to 200 Ω / □, preferably 80 to 180 Ω / □, and more preferably a sheet resistance of 135 to 165 Ω / It may be □, and if the sheet resistance is less than 30 Ω / □, the transmittance of the substrate may be lowered, and thus there may be a problem of visibility, and if it exceeds 200 Ω / □, there may be a problem that a reaction rate decreases.

Next, the liquid crystal layer 70 of the present invention serves to change a transparent, translucent or opaque state by a driving voltage applied from the outside, and as a polymer dispersed liquid crystal, including a liquid crystal and a polymer matrix, the polymer The matrix includes monomers, photoinitiators, coupling agents, oligomers, and spacers, but may be formed by ultraviolet (UV) radiation. Specifically, the liquid crystal layer 70 includes a nematic liquid crystal compound, a urethane oligomer and a thiol-based prepolymer mixture, a hexanediol diacrylate monomer and an ultraviolet photoinitiator (a photoinitiator that forms an absorbing peak in a wavelength range of = 380 nm) The liquid crystal dispersion composition may be formed by UV curing.

In addition, since the detailed description of the liquid crystal layer 70 of the present invention is described in detail in Korean Patent Registration No. 10-0171558 and Korean Patent Publication No. 10-2011-0053642, descriptions thereof will be omitted herein.

In addition, the liquid crystal layer 70 of the present invention may have a thickness of 5 to 35 μm, preferably a thickness of 16 to 24 μm, more preferably 18 to 22 μm, and if the thickness is less than 5 μm There may be a problem that the mura defect occurs due to poor uniformity of the product, and if it exceeds 35 μm, there may be a problem of an increase in driving power, a decrease in reagent angle, and an increase in haze.

Next, the liquid crystal film base layer 90 of the present invention serves as a support layer for the reverse film portion, and can be included without limitation as long as it is a material that can be commonly used in the art, preferably glass and PET (Polyethylene terephthalate) ), And more preferably, plasma or corona-treated PET.

In addition, the liquid crystal film base layer 90 of the present invention may have a thickness of 10 to 190 μm, preferably a thickness of 40 to 60 μm, more preferably a thickness of 45 to 55 μm, and if the thickness is 10 μm If less than, in manufacturing a smart window film, it may cause deformation of the substrate due to heat generated during drying and curing, and may cause a problem of tearing due to tension applied to the substrate during the roll-to-roll process. In addition, when the thickness exceeds 190 μm, there may be a problem of an increase in raw material cost and a shorter length that can be wound on one roll, resulting in an increase in process time due to an increase in roll replacement time.

Finally, the pressure-sensitive adhesive layer 100 of the present invention is to function to adhere the smart window film to the glass, and can be included without limitation as long as it is a component of the pressure-sensitive adhesive layer that can be used in a smart window film, preferably poly Ester resins, urethane resins, acrylic resins and derivatives thereof may include one or more selected from resins, preferably acrylic resins.

In addition, the pressure-sensitive adhesive layer 100 of the present invention may have a thickness of 10 ~ 30 ㎛, preferably 16 ~ 24 ㎛, more preferably 18 ~ 22 ㎛, if the thickness is less than 10 ㎛ adhesive strength will be reduced When the thickness exceeds 30 μm, the cost of raw materials and the curing time become longer, and thus the production speed is lowered and a large amount of heat is required, which may cause energy consumption to increase.

Meanwhile, the pressure-sensitive adhesive layer 100 of the present invention may further include an ultraviolet / near-infrared ray blocking agent in order to provide better ultraviolet and near-infrared ray blocking performance. The ultraviolet / near infrared ray blocking agent may include, without limitation, any ultraviolet ray / near infrared ray blocking agent commonly used in the art, preferably tungsten trioxide, antimony tin oxide (ATO), indium tin oxide (Indium Tin Oxide) , Cesium tungstate oxide (Cesium Tungstate Oxide, CTO) and may include one or more selected from zinc oxide (Zinc Oxide, ZnO). In this case, the ultraviolet / near infrared ray blocking agent may be provided in a sol form, but is not limited thereto.

On the other hand, the smart window film of the present invention is used to be applied to a divider, a skylight of a building opening, a highway sign, a bulletin board, a scoreboard, a clock or an advertising screen, or a window or a superstructure of a car, bus, aircraft, ship or train It can be used as a pro.

Furthermore, the smart window film of the present invention may have a solar heat gain coefficient (SHGC) of 0.5% or less, preferably 0.1 to 0.4%, and more preferably 0.2 to 0.3%.

In addition, the smart window film of the present invention may have an emissivity of 0.3 or less, preferably 0.1 to 0.3, and more preferably 0.15 to 0.25.

In addition, the smart window film of the present invention may have emissivity maintenance durability of 0.3 or less, preferably 0.05 to 0.3, and more preferably 0.1 to 0.2.

In addition, the smart window film of the present invention may have a weather resistance color difference change of 5 or less, preferably 3 or less, and more preferably 0.05 to 0.15.

In addition, the smart window film of the present invention may have a thermal transmittance of 1.0 to 5.0 W / m 2 K, preferably 2 to 4 W / m 2 K, and more preferably 3 to 4 W / m 2 K.

In addition, the smart window film of the present invention may have a haze of 5 to 7%, preferably 5.5 to 6.8%, and more preferably 6 to 6.7%.

Meanwhile, referring to FIGS. 2 to 7, the method for manufacturing a smart window film of the present invention includes first to third steps.

The first step of the manufacturing method of the smart window film of the present invention includes a first film portion on which a first electrode layer 60 is deposited on one surface of a reflective film base layer of a reflective film portion, and a second electrode layer on one surface of a liquid crystal film base layer 90. The deposited second film portion and the liquid crystal layer 90 may be prepared.

The first film portion of the present invention may be manufactured through steps 1-1 and 1-2. Specifically, referring to FIG. 2, in step 1-1, the first metal oxide layer 40 and the first metal oxide layer 40 are formed on one surface of the reflective film base layer 50 by a sputtering process. The reflective metal layer 30 on one surface, the second metal oxide layer 20 on one surface of the reflective metal layer 30, and the first electrode layer 60 on the other surface of the reflective film base layer 50 may be sequentially deposited.

At this time, the sputtering process applies a power of 1 to 3 kW with a pulse of 150 kHz to 250 kHz to secure the base vacuum at 1.5 × 10 ^-5 to 3.5 × 10 ^-5 torr, and then argon gas 150 to 350 sccm (standard cubic centimeter per minute) can be performed under nitrogen gas at a rate of 3% to 7% by weight.

Next, referring to FIG. 3, in steps 1-2, a transparent protective layer forming composition may be coated on one surface of the second metal oxide layer 20 and cured to form a transparent protective layer 10.

At this time, the transparent protective layer forming composition may include a copolymer forming composition and a solvent including urethane acrylate, epoxy-modified acrylate, and acrylic resin. Further, the urethane acrylate and the epoxy-modified acrylate may be oligomers or resins, preferably oligomers.

The solvent may include, without limitation, any solvent commonly used in the art, and preferably methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK), ethyl acetate, methyl acetate, butyl acetate, xylene, acetic acid , Ethyl alcohol, methyl alcohol, butyl alcohol and isopropyl alcohol may include at least one selected from, and more preferably methyl isobutyl ketone (MIBK).

In addition, the transparent protective layer forming composition of the present invention may include 40 to 85 parts by weight of solvent, preferably 50 to 80 parts by weight based on 100 parts by weight of the copolymer forming composition.

In addition, the coating of step 1-2 may be performed through a micro gravure method, and curing is heat-cured at 30 to 90 ° C, preferably 45 to 75 ° C for 1 to 10 minutes, preferably 1 to 5 minutes. a can be performed, performing the UV curing at an intensity of 100 ~ 600mJ / cm ^2, preferably 200 ~ 5 00mJ / cm ^2.

Referring to FIG. 4, the second film portion of the present invention may be manufactured by depositing a second electrode layer 80 on one surface of the liquid crystal film base layer 90 by a sputtering process.

At this time, the sputtering process applies a power of 1 to 3 kW with a pulse of 150 kHz to 250 kHz to secure the base vacuum at 1.5 × 10 ^-5 to 3.5 × 10 ^-5 torr, and then argon gas 150 to 350 sccm (standard cubic centimeter per minute) can be performed under nitrogen gas at a rate of 3% to 7% by weight.

Next, referring to FIGS. 5 and 6, the second step of the method for manufacturing a smart window film of the present invention is to laminate the liquid crystal layer 70 between the first film portion and the second film portion. ), And then cured to produce a third film portion.

Specifically, the second step is a liquid crystal layer between the first and second film portions 2-1, where the first electrode layer 60 of the first film portion and the second electrode layer 80 of the second film portion are positioned to face each other. The second and second steps so that 70 is positioned, and the second and third steps of curing the first and second film portions by lining. In other words, the lamination may be performed through a gap roller. Before passing through the gap roller, the first electrode layer 60 of the first film portion and the second electrode layer of the second film portion (before passing through the gap roller) 80) By placing it and putting it in the gap roller, it is possible to manufacture a third film portion by performing lamination. At this time, it can be performed at a speed of 15m / min ~ 60m / min. In addition, it can be performed at a strength of about 1 to 6 mW with a Black BLB lamp under curing conditions.

Lastly, referring to FIG. 7, in the third step of the method for manufacturing a smart window film of the present invention, a smart window film is formed by forming an adhesive layer 100 on one side of the liquid crystal film base layer 90 of the third film unit. Can be produced.

Specifically, in the third step of the manufacturing method of the smart window film of the present invention, an adhesive layer forming composition may be applied to one surface of the liquid crystal film base layer 90 of the third film part, and an adhesive layer may be formed through a comma coating method. .

On the other hand, the manufacturing method of the smart window film of the present invention may include steps (1) and (2) as another embodiment.

First, as another embodiment of the method of manufacturing a smart window film of the present invention, step (1) is a first film portion on which a first electrode layer is deposited on one surface of the reflective film base layer of the reflective film portion, and one surface of the liquid crystal film base layer. A second film portion and a liquid crystal layer in which a second electrode layer is deposited and an adhesive layer is deposited on the other surface of the liquid crystal film base layer may be prepared.

Next, as another embodiment of the method of manufacturing a smart window film of the present invention, step (2) is laminated to a liquid crystal layer positioned between the first film portion and the second film portion, and then cured to be smart. Window films can be produced. Specifically, the first electrode layer of the first film portion and the second electrode layer of the second film portion are positioned to face each other, and the liquid crystal layer is positioned between the first and second film portions, after which the first and second film portions are laid. Nate and cure to produce a smart window film.

In other words, in manufacturing the smart window film of the present invention, the adhesive layer may be formed in the last step (third step), as mentioned above, as another embodiment, in step (1) the liquid crystal film base material A pressure-sensitive adhesive layer is deposited on the other surface of the layer, and a smart window film may be prepared later in step (2).

In the above, the present invention has been mainly described with reference to embodiments, but this is merely an example and does not limit the embodiments of the present invention, and those having ordinary knowledge in the field to which the embodiments of the present invention pertain will provide essential characteristics of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible without departing from the scope. For example, each component specifically shown in the embodiment of the present invention can be implemented by modification. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

Example 1: Preparation of smart window film

(1) Manufacturing of the first film part

PET having a thickness of 50 µm plasma-treated with the reflective film base layer 50 was used, and the first metal oxide layer 40 was deposited to a thickness of 35 nm on one surface of the reflective film base layer 50 by a sputtering process. . At this time, zinc tin oxide was used as the first metal oxide layer 40, and zinc tin oxide was used to include 35% by weight of zinc oxide and 65% by weight of tin oxide relative to the total weight%. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas The conditions were carried out. (See Fig. 2)

Silver-palladium-copper alloy (APC) was used as the reflective metal layer 30, and the reflective metal layer 30 was deposited to a thickness of 15 nm on one surface of the first metal oxide layer 40 by a sputtering process. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas The conditions were carried out. (See Fig. 2)

Zinc tin oxide was used as the second metal oxide layer 20, and zinc tin oxide was used as 35% by weight of zinc oxide and 65% by weight of tin oxide relative to the total weight%, and was used as a sputtering process. The second metal oxide layer 30 was deposited on one surface of the reflective metal layer 30 to a thickness of 35 nm. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas The conditions were carried out. (See Fig. 2)

The first electrode layer 60 uses a zinc tin compound (indium tin oxide, ITO) having a sheet resistance of 150 Ω / □, and the first electrode layer 60 on the other surface of the reflective film base layer 50 by a sputtering process Was deposited to a thickness of 25 nm. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas The conditions were carried out. (See Fig. 2)

A transparent protective layer forming composition is coated on one surface of the first metal oxide layer 20 through a micro gravure method, thermally cured at 60 ° C. for 3 minutes, and then UV cured at a strength of 300 mJ / cm ² to achieve a thickness of 1.2. A transparent protective layer 10 of µm was formed. (See Fig. 3)

The transparent protective layer-forming composition is a composition in which a copolymer-forming composition and methyl isobutyl ketone (MIBK) are mixed, and the copolymer-forming composition comprises a urethane acrylate oligomer, an epoxy-modified acrylate oligomer, and an acrylic resin of 1: 1 to 0.5. It is a composition comprising in weight ratio. In addition, the transparent protective layer forming composition contained 75 parts by weight of methyl isobutyl ketone (MIBK) based on 100 parts by weight of the copolymer forming composition. In addition, the copolymer prepared by copolymerizing the copolymer-forming composition has a weight average molecular weight of 2,500, an acid value of 3 mgKOH / g, and does not include an amine value.

(2) Production of the second film portion

PET having a thickness of 50 µm plasma-treated with the liquid crystal film base layer 90 was used, and a second electrode layer 80 was deposited to a thickness of 25 nm on one surface of the liquid crystal film base layer 90 by a sputtering process. At this time, a zinc tin compound (indium tin oxide, ITO) having a sheet resistance of 150 Ω / □ was used as the second electrode layer 80. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas The conditions were carried out. (See Fig. 4)

(3) Manufacturing of the third film part

The first electrode layer 60 of the first film portion and the second electrode layer 80 of the second film portion are positioned to face each other, and between the first electrode layer 60 of the first film portion and the second electrode layer 80 of the second film portion. After placing the liquid crystal layer 70 having a thickness of 20 μm, it was put into a gap roller and laminated at a rate of 15 m / min. (See FIG. 5)

Then, UV curing was performed to prepare a third film portion. At this time, UV curing was performed using a Black BLB lamp at an intensity of 6 mW. (See FIG. 6)

At this time, the liquid crystal layer 70 includes a nematic liquid crystal compound, a urethane oligomer and a thiol-based prepolymer mixture, a hexanediol diacrylate monomer and an ultraviolet photoinitiator (an photoinitiator that forms an absorbing peak in a wavelength range in the range of = 380 nm). The liquid crystal dispersion composition is formed by UV curing.

(4) Production of smart window film

A smart window film was prepared by applying a pressure-sensitive adhesive layer-forming composition on one side of the liquid crystal film base layer 90 previously prepared and forming a pressure-sensitive adhesive layer 100 having a thickness of 20 μm through a comma coating method. ( 7)

At this time, the pressure-sensitive adhesive layer forming composition is a composition in which methacrylate and tungsten trioxide are mixed.

Example 2: Preparation of smart window film

A smart window film was prepared in the same manner as in Example 1. Unlike Example 1, PET having a thickness of 100 µm plasma-treated with the reflective film base layer 50 was used, and PET having a thickness of 100 µm plasma-treated with the liquid crystal film base layer 90 was used.

Example 3: Preparation of smart window film

A smart window film was prepared in the same manner as in Example 1. Unlike Example 1, PET having a thickness of 188 µm plasma-treated with the reflective film base layer 50 was used, and PET having a thickness of 188 µm plasma-treated with the liquid crystal film base layer 90 was used.

Comparative Example 1: Preparation of smart window film (see FIG. 8)

(1) Manufacturing of the first film part

Prepare a 50 μm thick PET surface-treated with the reflective film base layer (50 ′) and deposit the first electrode layer (60 ′) to a thickness of 25 nm on one side of the reflective film base layer (50 ′) by a sputtering process. Ordered. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas Conditions. In addition, a zinc tin compound (indium tin oxide, ITO) having a sheet resistance of 150 Ω / □ was used as the first electrode layer 60.

(2) Production of the second film portion

A 50 µm thick PET surface-treated with plasma is used as the liquid crystal film base layer (90 '), and a second electrode layer (80') is deposited to a thickness of 25 nm on one side of the liquid crystal film base layer (90 ') by a sputtering process. Ordered. At this time, a zinc tin compound (indium tin oxide, ITO) having a sheet resistance of 150 Ω / □ was used as the second electrode layer 80 '. At this time, under the conditions of the sputtering process, 2kW of electric power was applied with a 200kHz pulse to secure the base vacuum at 2.5 × 10 ^-5 torr, and then nitrogen gas at a rate of 5% by weight based on 250 sccm (standard cubic centimeter per minute) of argon gas Conditions.

(3) Manufacturing of the third film part

The first electrode layer 60 'of the first film portion and the second electrode layer 80' of the second film portion are positioned to face each other, and the first electrode layer 60 'of the first film portion and the second electrode layer 80 of the second film portion The liquid crystal layer 70 'having a thickness of 20 µm was placed between'), and then put into a gap roller to laminate at a speed of 15 m / min.

Then, UV curing was performed to prepare a third film portion. At this time, UV curing was performed at a strength of 6 mW using a Black BLB lamp.

At this time, the liquid crystal layer 70 includes a nematic liquid crystal compound, a urethane oligomer and a thiol-based prepolymer mixture, a hexanediol diacrylate monomer and an ultraviolet photoinitiator (an photoinitiator that forms an absorbing peak in a wavelength range in the range of = 380 nm). The liquid crystal dispersion composition is formed by UV curing.

(4) Production of smart window film

A smart window film was prepared by applying a pressure-sensitive adhesive layer-forming composition on one side of the liquid crystal film base layer 90 'prepared in the third film portion and forming a 20-micrometer-thick pressure-sensitive adhesive layer 100' through a comma coating method. .

At this time, the pressure-sensitive adhesive layer forming composition is a composition in which methacrylate and tungsten trioxide are mixed.

Comparative Example 2: Preparation of smart window film

A smart window film was prepared in the same manner as in Comparative Example 1. Unlike Comparative Example 1, PET having a thickness of 100 µm plasma-treated with the reflective film base layer 50 ′ was used, and PET having a thickness of 100 µm plasma-treated with the liquid crystal film base layer 90 ′ was used.

Comparative Example 3: Preparation of smart window film

A smart window film was prepared in the same manner as in Comparative Example 1. Unlike Comparative Example 1, PET having a thickness of 188 µm plasma-treated with the reflective film base layer 50 ′ was used, and PET having a thickness of 188 µm plasma-treated with the liquid crystal film base layer 90 ′ was used.

Experimental Example: Measurement of physical properties of smart window film

Each of the smart window films prepared in Examples and Comparative Examples was subjected to the experiments described below, and the results measured through the experiments are shown in Table 1 below.

1. Emissivity measurement

As a ratio of the heat radiation radiation power emitted by the glass plate to the space and the heat radiation radiation power emitted by a black body of the same temperature, a spectrophotometer capable of measuring at least 5 to 25 μm of the heat radiation wavelength range of 5 to 50 μm at room temperature The vertical emissivity value (corrected emissivity) calculated by the method specified in KS L2514 was shown using the spectral reflectance measured by.

2. Measurement of solar heat acquisition rate

The ratio of the radiation flux of the solar radiation passing through the glass portion to the solar radiation incident on the window glass surface and the heat flux absorbed by the glass and transmitted to the room, as a ratio of the radiation flux of the incident solar radiation, KS L 2514 The solar heat acquisition rate was measured by the test method of.

3. Emissivity maintenance durability evaluation

After standing at a temperature of 85 ° C and a relative humidity of 85% for 500 hours, the emissivity was measured in the same manner as the emissivity measurement method.

4. Weatherability color difference change evaluation

Among the KS L 2016 methods, the color difference change was evaluated by a weather resistance measurement method.

5. Evaluation of heat permeability

Thermal permeability was measured by the method of measuring the film for KS L 2016 window glass.

6. Haze measurement

By using the haze-gard plus model of BYK's smart window film, the opaque state due to diffusion was measured in addition to reflection or absorption.

As shown in Table 1, the smart window film prepared in Examples 1 to 3 has significantly lower emissivity, solar heat acquisition rate, elongation retention durability, weather-resistant color difference, heat permeation rate, and haze than the smart window film prepared in Comparative Examples 1 to 3. Could confirm. In addition, it was confirmed that the haze of the smart window films prepared in Example 1 was lower than that of the smart window films prepared in Examples 2 to 3.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

10: transparent protective layer
20: second metal oxide layer
30: reflective metal layer
40: first metal oxide layer
50: reflective film base layer
60: first electrode layer
70: liquid crystal layer
80: second electrode layer
90: liquid crystal film base layer
100: adhesive layer

Claims (15)

A reflective film portion in which a reflective film base layer, a first metal oxide layer, a reflective metal layer, a second metal oxide layer and a transparent protective layer are sequentially stacked; And
A liquid crystal film portion in which a first electrode layer, a liquid crystal layer, a second electrode layer, a liquid crystal film base layer, and an adhesive layer are sequentially stacked; It is a smart window film having a thickness of 100 ~ 400㎛ containing,
The first electrode layer of the liquid crystal film portion is laminated on one surface of the reflective film base layer of the reflective film portion,
The reflective film portion and the liquid crystal film portion has a thickness ratio of 1: 1.41 to 4.16,
The reflective film base layer is a thickness of 40 ~ 100㎛, the liquid crystal film base layer is a smart window film, characterized in that having a thickness of 40 ~ 100㎛.
delete According to claim 1,
The reflective film base layer is a smart window film, characterized in that in physical contact with the first metal oxide layer and the first electrode layer.
According to claim 1,
The first metal oxide layer and the second metal oxide layer each has a thickness of 15 ~ 50㎚,
The reflective metal layer has a thickness of 5 ~ 25nm,
Smart window film characterized in that it satisfies both of the following conditions (1) and (2).
(One)

(2)

In the above conditions (1) and (2), a is the thickness of the first metal oxide layer, b is the thickness of the second metal oxide layer, and c is the thickness of the reflective metal layer.
According to claim 1,
The transparent protective layer has a thickness of 0.5 ~ 2.5㎛,
Each of the first electrode layer and the second electrode layer has a thickness of 15 to 40 nm,
The liquid crystal layer has a thickness of 5 ~ 35㎛,
The adhesive layer is a smart window film, characterized in that it has a thickness of 10 ~ 30㎛.
According to claim 1,
The transparent protective layer comprises a copolymer of urethane acrylate, epoxy-modified acrylate and acrylic resin,
The copolymer has a urethane acrylate, an epoxy-modified acrylate, and an acrylic resin copolymerized in a weight ratio of 1: 0.2 to 3.5: 0.05 to 2.5, a weight average molecular weight of 800 to 15,000, an acid value of 12 or less, and an amine value of 7 or less. And
The first metal oxide layer and the second metal oxide layer are zinc tin oxide (Zinc Tin Oxide, ZTO) containing 25 to 45% by weight of zinc oxide (ZnO) and 55 to 75% by weight of tin oxide (SnO ₂ ), respectively. Smart window film comprising a.
According to claim 1,
The reflective metal layer includes a silver-palladium-copper alloy (Ag-Pd-Cu alloy, APC),
The reflective film base layer and the liquid crystal film base layer each include at least one selected from glass and PET (Polyethylene terephthalate),
The first electrode layer and the second electrode layer each include at least one selected from indium tin oxide (ITO) and a conductive polymer,
The liquid crystal layer includes a liquid crystal and a polymer matrix,
The pressure-sensitive adhesive layer is a smart window film, characterized in that it comprises at least one selected from resins including polyester resins, urethane resins, acrylic resins, silicone resins and derivatives thereof.
According to claim 1,
The first electrode layer and the second electrode layer is a smart window film, characterized in that the sheet resistance is 30 ~ 200 Ω / □, respectively.
According to claim 1,
The smart window film is a smart window film, characterized in that the solar heat gain (SHGC, Solar Heat Gain Coefficient) is less than 0.5%.
According to claim 1,
The smart window film is a smart window film, characterized in that the emissivity is 0.3 or less.
A first step of preparing a first film portion in which a first electrode layer is deposited on one surface of a reflective film base layer of a reflective film portion, a second film portion in which a second electrode layer is deposited on one surface of a liquid crystal film base layer, and a liquid crystal layer;
A second step of laminating such that a liquid crystal layer is positioned between the first film portion and the second film portion, and then curing to produce a third film portion; And
A third step of forming a pressure-sensitive adhesive layer on one surface of the liquid crystal film base layer of the third film portion to produce a smart window film having a thickness of 100 to 400 μm; Including,
The liquid crystal film portion includes a first electrode layer, a liquid crystal layer, a second electrode layer, a liquid crystal film base layer, and a pressure-sensitive adhesive layer, wherein the reflective film portion and the liquid crystal film portion have a thickness ratio of 1: 1.41 to 4.16,
The reflective film base layer has a thickness of 40 ~ 100㎛, the liquid crystal film base layer has a thickness of 40 ~ 100㎛ manufacturing method of a smart window film.
The method of claim 11, wherein the second step
Step 2-1 of positioning the first electrode layer of the first film portion and the second electrode layer of the second film portion facing each other;
A 2-2 step of positioning a liquid crystal layer between the first and second film parts; And
Step 2-3 of curing the first and second film parts by being lined;
Method of manufacturing a smart window film, characterized in that it comprises a
The method of claim 11,
The first film portion
A first metal oxide layer on one surface of the reflective film base layer, a reflective metal layer on one surface of the first metal oxide layer, a second metal oxide layer on one surface of the reflective metal layer, and a first electrode layer on the other surface of the reflective film base layer by a sputtering process Step 1-1 to sequentially deposit; And
Steps 1-2 of coating a composition for forming a transparent protective layer on one surface of the second metal oxide layer and curing to form a transparent protective layer;
Method of manufacturing a smart window film, characterized in that is manufactured through.
The method of claim 13,
The transparent protective layer forming composition
A copolymer forming composition and a solvent comprising urethane acrylate, epoxy-modified acrylate, and acrylic resin,
The solvent is at least one selected from methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK), ethyl acetate, methyl acetate, butyl acetate, xylene, acetic acid, ethyl alcohol, methyl alcohol, butyl alcohol and isopropyl alcohol Includes,
Method for producing a smart window film comprising 40 to 85 parts by weight of a solvent with respect to 100 parts by weight of the copolymer-forming composition.
(1) The first film portion where the first electrode layer is deposited on one side of the reflective film base layer of the reflective film portion, and the second electrode layer is deposited on the other side of the liquid crystal film base layer and the second film portion where the adhesive layer is deposited on the other side of the liquid crystal film base layer. And preparing a liquid crystal layer; And
(2) laminating such that a liquid crystal layer is positioned between the first film portion and the second film portion, and then curing to produce a smart window film having a thickness of 100 to 400 μm; Including,
The liquid crystal film portion includes a first electrode layer, a liquid crystal layer, a second electrode layer, a liquid crystal film base layer, and a pressure-sensitive adhesive layer, wherein the reflective film portion and the liquid crystal film portion have a thickness ratio of 1: 1.41 to 4.16,
The reflective film base layer has a thickness of 40 ~ 100㎛, the liquid crystal film base layer has a thickness of 40 ~ 100㎛ manufacturing method of a smart window film.

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