KR20080051311A - Silver reflection film and method for making the same - Google Patents

Silver reflection film and method for making the same Download PDF

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KR20080051311A
KR20080051311A KR1020060122157A KR20060122157A KR20080051311A KR 20080051311 A KR20080051311 A KR 20080051311A KR 1020060122157 A KR1020060122157 A KR 1020060122157A KR 20060122157 A KR20060122157 A KR 20060122157A KR 20080051311 A KR20080051311 A KR 20080051311A
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film
silver
pretreatment
polyurethane
coating
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KR1020060122157A
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Korean (ko)
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KR100861146B1 (en
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김종욱
김재환
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(주)한누리
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
    • G02B5/085—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal
    • G02B5/0858—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal the reflecting layers comprising a single metallic layer with one or more dielectric layers
    • G02B5/0866—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal the reflecting layers comprising a single metallic layer with one or more dielectric layers incorporating one or more organic, e.g. polymeric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate

Abstract

A silver reflection film and a method for manufacturing the same are provided to increase productivity and reduce a manufacturing cost by simplifying a manufacturing process. A PET film(1) is used as a base material. A pre-processing layer(3) is formed on the PET film in order to improve adhesive characteristics. A fine concavo-convex surface(5) is obtained by processing a surface of the pre-processing layer in a corona discharging manner. A silver layer(7) for reflecting light is formed on an upper surface of the concavo-convex surface in a liquid injection manner. A discoloration prevention layer(9) is formed to prevent the silver layer. A phase protection layer(11) is formed on an upper surface of the discoloration prevention layer.

Description

은 반사필름 및 그 제조방법{SILVER REFLECTION FILM AND METHOD FOR MAKING THE SAME}Silver reflective film and its manufacturing method {SILVER REFLECTION FILM AND METHOD FOR MAKING THE SAME}

도 1은 본 발명의 은 반사필름을 도시한 단면도.1 is a cross-sectional view showing a silver reflective film of the present invention.

본 발명은 페트(PET: poly ethylen terephthalate)필름을 기재로 사용하여 표면을 플라즈마 처리하고 그 상면에 액상 분사방식으로 은(Ag)을 안착시켜, 제조 공정을 개선하고 반사특성을 향상시킬 수 있도록 한 액정표시소자 또는 조명등에 적합하게 사용할 수 있는 은 반사필름 및 그 제조방법에 관한 것이다.The present invention uses a PET (poly ethylen terephthalate) film as a base material to plasma treatment and to deposit the silver (Ag) by the liquid injection method on the upper surface, to improve the manufacturing process and improve the reflection characteristics The present invention relates to a silver reflective film that can be suitably used in liquid crystal display devices or lightings, and to a method of manufacturing the same.

근래에는 AV 및 정보기기들의 발달이 촉진되고, 휴대형 컴퓨터와 디지털 무선통신 및 휴대용 주변장치들을 이용하여 정보화 및 멀티미디어 사회가 도래되었다. 이러한 이유에서 휴대성이 높은 노트북, PDA(Personal Digital Assistants:개인용 디지털 보조기) 등과 같은 정보기기들은 이동성을 고려하여 보다 박형이며 경량임과 동시에, 저소비전력의 액정표시소자가 요구되고 있다.In recent years, the development of AV and information equipment has been promoted, and the information and multimedia society has been introduced by using portable computers, digital wireless communication and portable peripheral devices. For this reason, information devices such as portable notebooks and personal digital assistants (PDAs), which are highly portable, require thinner, lighter, lower power consumption liquid crystal display devices in consideration of mobility.

액정표시소자로서는 백라이트를 액정패널의 배면에 배치한 투과형과, 반사판을 배치하여 외광을 이용하는 반사형이 있다. 또한, 하프미러를 구비한 액정표시소 자로서, 밝은 환경하에서는 외광을 반사시켜 조명광으로서 이용하고, 어두운 환경하에서는 백라이트를 병용하는 반투과형(半透過型)도 있다. 특히 반사형 액정표시소자는 외광을 반사시키는 것에 의해 화상을 표시하는 방식으로서, 배면에 알루미늄 또는 은으로 이루어지는 산란반사판을 배치하고 있다. As a liquid crystal display element, there are a transmissive type in which a backlight is disposed on the rear surface of the liquid crystal panel, and a reflective type in which a reflector is arranged to use external light. As a liquid crystal display device having a half mirror, there is also a semi-transmissive type which reflects external light in a bright environment and uses it as illumination light, and uses a backlight together in a dark environment. In particular, the reflective liquid crystal display device displays an image by reflecting external light, and a scattering reflector plate made of aluminum or silver is disposed on the back surface.

반사판은 보다 밝고 양호한 표시를 위해, 입사광을 표시화면에 수직인 정시각(正視角) 방향으로 반사·산란시키고, 광의 강도를 증가시킬 필요가 있다. 그러나 종래의 반사판, 예컨대 기판 상에 경면(鏡面)형태의 금속막이 성막된 것을 사용한 경우에는 시인(視認)성이 떨어지고 화면이 매우 어둡게 표시되는 과제가 있었다.In order to display a brighter and better display, it is necessary to reflect and scatter incident light in the direction of the right angle perpendicular to the display screen, and increase the intensity of the light. However, when a conventional reflective plate, for example, a mirror-shaped metal film is formed on a substrate, there is a problem that the visibility is poor and the screen is displayed very dark.

이와 같은 과제에 대하여, 예를 들어 국내 등록특허공보 제10-0407413호(2003. 11. 17)에는 반사특성이 뛰어난 반사판 및 그 제조방법, 및 그 반사판을 구비한 반사형 액정표시소자가 개시되어 있다.With respect to such a problem, for example, Korean Patent Publication No. 10-0407413 (Nov. 17, 2003) discloses a reflection plate having excellent reflection characteristics, a manufacturing method thereof, and a reflection type liquid crystal display device having the reflection plate. have.

그러나 상기 공보에 게시된 반사판은 반사특성이 향상되기는 하였지만, 기재로서 유리기판을 사용하기 때문에 휴대용 정보기기의 박형화에 적합하지 않고, 또한 요철구조체의 제조 공정이 복잡하며, 더욱 액정표시소자의 셀갭을 유지하는 역할까지 담당해야 하므로 구조가 복잡해지는 문제점이 있었다.However, although the reflecting plate disclosed in the above publication has improved reflection characteristics, the glass substrate is used as the substrate, and therefore, the reflector is not suitable for thinning portable information devices, and the manufacturing process of the uneven structure is complicated, and the cell gap of the liquid crystal display device is further increased. There was a problem in that the structure is complicated because it must play a role.

이러한 과제에 대하여, 근래에는 기재로서 PET필름을 사용하는 박형 반사필름이 개발되었다.In response to this problem, a thin reflective film using a PET film as a base material has recently been developed.

이러한 반사필름의 종래 공지된 제조방법으로는 기재의 일면 상부에 은(Ag)을 진공증착하게 되는바 이를 크게 분리하면, ① 물리증착법 : PVD(Physical Vapor Deposition), ② 화학증착법 : CVD(Chemical Vapor Deposition)의 2종류가 있다.In the conventionally known method for manufacturing such a reflective film, silver (Ag) is vacuum-deposited on one surface of a substrate, and when it is largely separated, ① physical vapor deposition method: PVD (Physical Vapor Deposition), ② chemical vapor deposition method: CVD (Chemical Vapor) There are two kinds of Deposition).

또한 반사필름의 제조방법으로 널리 이용되고 있는 물리증착법은 A. 저항가열식 증착(Evaporation)과 B. 스퍼터링(Sputtering) 증착 C. 이온 플래팅(Ionplating) 증착으로 구분되고 있으며, 여기서 플라즈마를 사용하는 스퍼터링과 이온플래팅 방법은 PAPCV(Plasma assisted PVD)로 구분된다.In addition, physical vapor deposition, which is widely used as a method of manufacturing a reflective film, is classified into A. Evaporation and B. Sputtering deposition. C. Ionplating deposition, where sputtering using plasma is used. And ion plating methods are classified into Plasma assisted PVD (PAPCV).

그러나 종래의 반사필름 제조방법들은 제조 방식의 특성상 장비 자체가 고가이고, 단순히 기재(피착제)에 은(Ag)을 증착하게 되므로 피착되는 은의 양이 일정하지 못하고 생산성이 낮으며 공정 관리가 어려운 문제점이 있고, 그 결과 제조 비용이 상승되는 결과를 초래하게 된다.However, the conventional reflective film manufacturing method is expensive due to the nature of the manufacturing method, and simply deposits silver (Ag) on the substrate (adhesive), the amount of silver deposited is not constant, productivity is low, and process management is difficult This results in an increase in manufacturing costs.

또한, 고체를 기체화시켜 기재에 은을 증착시키므로 미세한 핀홀(Pinhole) 현상이 생길 수 밖에 없고, 산화방지를 위해 은을 증착한 후 연속 공정으로 산화방지 및 내습방지 코팅을 실시해야만 하는 단점이 있다.In addition, since a solid vaporizes silver onto the substrate, fine pinholes may occur, and there is a disadvantage in that an anti-oxidation and a moisture proof coating must be applied in a continuous process after silver is deposited for oxidation. .

이러한 과제에 대하여, 최근에는 마이크로 그라비아 코팅법을 이용한 은 잉크 코팅법이 개발되고 있으나, 이는 원재료가 수지에 은(Ag)을 포함 휘발성 용제가 사용되므로 건조 시간이 길고 건조시 150℃ 이상의 고온을 유지해야 하므로 기재인 PET필름의 열화가 발생하거나 주름 변형이 생기는 제품 불량을 초래하게 된다. 또한, 코팅과 건조 공정에서 발생된 기포 및 가스가 미세한 핀홀을 생성시켜 불량 요인으로 작용하고 있다.Recently, the silver ink coating method using the microgravure coating method has been developed, but since the volatile solvent containing silver (Ag) as a raw material is used, the drying time is long and maintains a high temperature of 150 ° C. or higher during drying. Since it is necessary to deteriorate the PET film as the base material or wrinkles will cause product defects. In addition, bubbles and gases generated in the coating and drying processes generate fine pinholes, and thus act as a defect factor.

본 발명의 목적은 상술한 종래 기술의 문제점을 해결하기 위한 것으로서, 기 재에 안착되는 은(Ag) 막을 일정하게 형성하고, 핀홀 현상을 제거함으로써 결과적으로 제품의 반사특성을 향상시킬 수 있도록 함에 제1 목적을 두고 있다.SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to form a silver film deposited on a substrate uniformly and to eliminate pinholes, thereby improving the reflective properties of the product. 1 purpose.

또한 제조공정을 단순화하고 용이하게 실현하며, 제조 비용을 절감시킬 수 있도록 함에 제2 목적을 두고 있다.In addition, the second object is to simplify and facilitate the manufacturing process, and to reduce the manufacturing cost.

상기 목적에 따라, 본 발명에서는 기재로 사용되는 PET필름; 그 상부에 부착성 향상을 위해 도포 형성되는 전처리막; 상기 전처리막의 표면을 코로나방전 처리하여 얻어지는 미세 요철면; 상기 요철면의 상부에 광반사를 위해 액상 분사식으로 도포 형성되는 은막; 상기 은막을 보호하기 위해 도포 형성되는 변색방지막; 그리고 상기 변색방지막의 상부에 도포 형성되는 상보호막을 포함하여 이루어지는 은 반사필름을 제안한다.According to the above object, in the present invention, PET film used as a base material; A pretreatment film coated on the upper portion to improve adhesion; Fine uneven surface obtained by corona discharge treatment of the surface of the pretreatment membrane; A silver film coated on the upper surface of the uneven surface by liquid injection for light reflection; Discoloration preventing film is formed to protect the silver film; And it proposes a silver reflecting film comprising an upper protective film is formed on top of the discoloration prevention film.

또한, 상기 은 반사필름을 제조하기 위한 방법으로서, 롤투롤방식으로 플라즈마 발생장치를 통과시키면서 PET필름의 표면 이물질을 제거하는 단계; PET필름의 상면에 폴리우레탄계, 에폭시계 또는 변성아크릴계 투명도료 중에서 하나를 선택하여 분사 도포하고, 건조로를 통과시켜 전처리막을 형성하는 단계; 연속하여 코로나방전장치를 거쳐 전처리막의 표면에 미세 요철면을 형성하는 단계; 연속 공정으로 요철면의 표면에 질산은과 환원액을 동시에 분사하여 은경반응에 의한 은이 석출되도록 하고, 세척, 수분 제거 및 건조시켜 은막을 형성하는 단계; 상기 은막의 상부에 투명도료를 도포 건조하여 변색방지막을 형성하는 단계: 그리고 상기 변색방지막의 상부에 폴리우레탄계, 에폭시계 및 변성아크릴계 수지를 주성분으로 하여 혼 합된 투명도료를 도포하고, UV경화장치를 통과시켜 상보호막을 형성하는 단계로 이루어짐을 특징으로 하는 은 반사필름의 제조방법을 제안한다.In addition, the method for producing the silver reflecting film, the step of removing the surface foreign matter of the PET film while passing through the plasma generating apparatus in a roll-to-roll method; Spray coating by selecting one of the polyurethane, epoxy, or modified acrylic transparent paint on the upper surface of the PET film, and passing the drying furnace to form a pretreatment film; Continuously forming a fine concavo-convex surface on the surface of the pretreatment film via a corona discharge device; Simultaneously spraying silver nitrate and a reducing solution on the surface of the uneven surface in a continuous process to precipitate silver by a silver diameter reaction, and washing, removing water, and drying to form a silver film; Forming a discoloration prevention film by coating and drying a transparent paint on the upper part of the silver film: and applying a mixed transparent paint with a polyurethane, epoxy and modified acrylic resin as a main component on the discoloration prevention film, and applying a UV curing device. It proposes a method for producing a silver reflecting film, characterized in that it consists of a step of forming an upper protective film by passing.

이하, 첨부 도면에 의거하여 본 발명을 더욱 상세하게 설명하기로 한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 1은 본 발명의 은 반사필름의 층 구조로 보여주고 있다.1 shows a layer structure of the silver reflecting film of the present invention.

도면을 통하여 알 수 있는 바와 같이, 본 발명의 은 반사필름은 박막의 필름특성, 전기적 성질 및 내후성이 좋은 PET필름(1)을 기재로 사용하여 각 층 구조로 형성하게 되는 것이다.As can be seen through the drawings, the silver reflecting film of the present invention is to be formed in each layer structure using the PET film 1 having good film properties, electrical properties and weather resistance of the thin film as a substrate.

PET필름(1)의 상부에는 표면 평활성 및 내부식성을 향상시키기 위해 전처리막(3)을 코팅 형성한다. 전처리막(3)은 폴리우레탄계, 에폭시계 또는 변성아크릴계 도료 중에서 하나를 선택하여 도포 형성할 수 있다.On top of the PET film 1, a coating of the pretreatment film 3 is performed to improve surface smoothness and corrosion resistance. The pretreatment film 3 may be formed by applying one of a polyurethane-based, epoxy-based, or modified acrylic paint.

전처리막(3)은 표면을 요철면(5)으로 처리하여 부착성을 향상시킨다. 요철면(5)의 상부에는 광반사특성을 위하여 은막(7)을 형성한다. 은막(7)은 본 발명의 특징적인 구성으로서 액상분사식 증착법으로 형성한다.The pretreatment film 3 treats the surface with the uneven surface 5 to improve adhesion. The silver film 7 is formed on the uneven surface 5 for the light reflection characteristic. The silver film 7 is formed by the liquid jet deposition method as a characteristic constitution of the present invention.

생성 완료된 은막(7)의 상부에는 이를 보호하기 위한 목적으로 변색방지막(9)을 도포 형성하고, 다시 그 상부에는 은막의 내후성 및 내구력을 유지하기 위한 목적으로 상보호막(11)을 형성한다.The discoloration preventing film 9 is coated on the upper part of the generated silver film 7 for the purpose of protecting the same, and the upper protective film 11 is formed on the upper part of the silver film 7 for the purpose of maintaining the weather resistance and durability of the silver film.

변색방지막(9)은 변색방지제인 투명도료를 도포 형성하여 얻어질 수 있다.The discoloration preventing film 9 can be obtained by coating and forming a transparent paint which is a discoloration preventing agent.

또 상보호막(11)은 내부식성 및 내스크래치성을 향상과 내습방지를 향상시키기 위한 것이며, 더욱 후 가공시의 유연성을 확보하기 위한 것으로서, 연질의 투명도료를 사용하여 형성한다. 더욱 구체적으로 연질의 투명도료는 폴리우레탄계, 에 폭시계 및 변성아크릴계 수지를 주성분으로 하여 혼합한 것으로서, 성형된 후 연질경도는 3H 미만이어야 한다.In addition, the upper protective film 11 is to improve corrosion resistance and scratch resistance and to prevent moisture resistance, and to secure flexibility in post-processing, and is formed using a soft transparent paint. More specifically, the soft transparent paint is a mixture of polyurethane, epoxy and modified acrylic resins as main components, and after molding, the soft hardness should be less than 3H.

이렇게 형성된 본 발명의 은 반사필름을 제조하기 위한 바람직한 제조방법을 더욱 상세하게 설명하면 다음과 같다.If described in more detail a preferred manufacturing method for producing a silver reflective film of the present invention formed as follows.

실시예Example

적용하고자 하는 기재로서 PET필름(1)을 마련하고, 그 표면의 이물질(먼지, 기름 등)을 제거하는 공정을 수행한다. 이 공정을 위하여 본 발명에서는 광폭(1,000~2,000mm)의 PET필름(2)을 롤투롤(Roll To Roll) 방식으로 이동시키면서, 플라즈마 발생장치를 통과시키게 된다.A PET film 1 is prepared as a substrate to be applied, and a process of removing foreign matter (dust, oil, etc.) from the surface thereof is performed. For this process, in the present invention, the PET film 2 having a wide width (1,000 to 2,000 mm) is moved in a roll-to-roll manner and passed through a plasma generator.

그러나 플라즈마는 유기화합물만을 세척할 수 있고, 무기화합물은 세척이 되지 않으므로 부러쉬 및 초순수를 사용하여 PET필름(1)의 표면을 완벽하게 세척한다.However, since the plasma can only clean the organic compound, the inorganic compound is not washed, the surface of the PET film 1 is completely cleaned by using a brush and ultrapure water.

이후, PET필름(1)의 표면에 평활성 및 내부식성 향상을 위해 폴리우레탄계, 에폭시계 또는 변성아크릴계 투명도료 중에서 하나를 선택하고, 이를 분사 노즐을 이용하여 2~5㎛의 두께로 도포한 다음, 50~140℃의 건조로에서 10m/min의 저속으로 통과시키면서 건조시킴으로서 전처리막(3)을 형성한다.Then, to improve the smoothness and corrosion resistance on the surface of the PET film 1, one of the polyurethane-based, epoxy-based or modified acrylic-based transparent paint is selected, and applied to a thickness of 2 ~ 5㎛ using a spray nozzle, The pretreatment membrane 3 is formed by drying while passing at a low speed of 10 m / min in a drying furnace at 50 to 140 ° C.

전처리막(3)이 형성된 필름은 연속하여 코로나방전장치를 거치면서 그 표면에 미세 요철면(5)을 형성함으로써, 이후 은막의 부착성을 향상시킬 수 있다.The film on which the pretreatment film 3 is formed continuously forms a fine concavo-convex surface 5 on its surface while passing through the corona discharge device, whereby the adhesion of the silver film can be improved.

연속 공정으로, 요철면의 표면에 은액과 환원액을 동시에 분사하여 은경반응에 의한 은(Ag)을 석출시키고 균일한 두께(0.2~0.6㎛)의 은막(7)을 형성한다.In a continuous process, silver and a reducing liquid are sprayed simultaneously on the surface of the uneven surface to precipitate silver (Ag) by the silver diameter reaction and form a silver film 7 having a uniform thickness (0.2 to 0.6 mu m).

Figure 112006090106073-PAT00001
Figure 112006090106073-PAT00001

Figure 112006090106073-PAT00002
Figure 112006090106073-PAT00002

Figure 112006090106073-PAT00003
Figure 112006090106073-PAT00003

상기 반응식 1은 은경반응을 보여주고 있다. 이때 불완전 반응물질 및 반응시 부산물이 생성된다. 이를 제거하기 위하여 초순수로 은막(7)을 2~5초간 0.5~1.5㎏/㎠의 수압으로 세척하고, 1~3㎏/㎠의 압축공기로 2~5초간 분사하여 1차로 수분을 제거한 다음, 50~140℃의 건조로에서 10m/min의 저속으로 통과시켜 은막(7)을 완성한다.Scheme 1 shows the silver diameter reaction. Incomplete reactants and by-products are generated during the reaction. To remove this, the silver film 7 was washed with ultrapure water at a pressure of 0.5 to 1.5 kg / cm 2 for 2 to 5 seconds, and then sprayed with compressed air at 1 to 3 kg / cm 2 for 2 to 5 seconds to remove moisture first. The silver film 7 is completed by passing at a low speed of 10 m / min in a drying furnace at 50 to 140 ° C.

이와 같이 형성된 은막(7)의 상부에는 변색방지 및 내습성 향상을 위하여 투명도료인 변색방지제를 분사 도포하여 1~3㎛의 두께로 변색방지막(9)을 형성한다.The discoloration prevention film 9 is formed to a thickness of 1 to 3 μm by spray coating a discoloration preventing agent, which is a transparent paint, on the upper portion of the silver film 7 formed as described above to improve discoloration prevention and moisture resistance.

이어서 변색방지막(9)의 위에 스크러치성 향상 및 절곡성, 가공성 향상을 위하여 폴리우레탄계, 에폭시계 및 변성아크릴계 수지를 주성분으로 하여 혼합된 투명도료를 2~7㎛의 두께로 도포하고, 50~140℃의 건조로에서 10~50m/min의 저속으로 통과시켜 상보호막(11)을 도포하며, 이후 UV경화장치를 통과시켜 상보호막(11)을 완성한다.Subsequently, in order to improve scratchability, bendability, and processability, the mixed transparent coating material containing polyurethane, epoxy and modified acrylic resins as a main component is applied on the discoloration preventing film 9 to a thickness of 2 to 7 μm. The passivation layer 11 is applied by passing it at a low speed of 10 to 50 m / min in a drying furnace at 140 ° C., and then passes through the UV curing apparatus to complete the passivation layer 11.

한편, 상보호막(11) 코팅시 용제형 도료를 사용하면 레인보우 현상, 황변 현상이 발생하기 쉬워 반사율(%)에 저해 요인으로 작용하므로, 이러한 현상을 방지할 수 있는 도료가 필요하게 되었다. 이를 위하여 본 발명에서는 변성 폴리우레탄 수지 15중량%와, 아미노 수지 5중량% 그리고, 변성 아크릴 수지 10중량% 및 인산계 촉매 0.5~1중량%를 포함하며, 케톤, 에틸 아세테이트, 톨루엔을 용제로 사용하고, 고형분은 20~40%의 범위로 투명도료를 제조하였다.On the other hand, when the solvent-type coating is used to coat the upper protective film 11, rainbow phenomenon and yellowing phenomenon tend to occur, which acts as a deterrent to the reflectance (%), and thus a paint that can prevent such a phenomenon is required. To this end, in the present invention, 15% by weight of modified polyurethane resin, 5% by weight of amino resin, 10% by weight of modified acrylic resin and 0.5 to 1% by weight of phosphoric acid catalyst, ketone, ethyl acetate, toluene is used as a solvent. And, the solid content was prepared transparent paint in the range of 20 to 40%.

이와 같이 완성된 본 발명의 은 반사필름은 제품의 내구성 시험에서 360°접철시 각 층간 박리 현상이 없어야 한다. 이를 위하여 특히 상보호막(11)은 연질이어야 하며, 연필경도가 1H~3H의 범위에 있어야 한다.The silver reflecting film of the present invention thus completed should be free from delamination during 360 ° folding in the durability test of the product. For this purpose in particular the upper protective film 11 should be soft, the pencil hardness should be in the range of 1H ~ 3H.

시험예Test Example

이상에서 설명한 제조방법에 의하여 완성된 본발명의 은 반사필름의 부착력 시험을 위해 표면에 1mm 간격으로 크로스 커닝하고, 포장용 박스 테이프를 1.5kg의 힘으로 부착시켜 3kg의 힘으로 당겼을 때 박리 현상이 없음을 확인하였다.The peeling phenomenon of the present invention, which was completed by the above-described manufacturing method, was cross-cured on the surface at intervals of 1 mm for adhesion test of the silver reflective film, and the packaging box tape was attached with 1.5 kg of force and pulled with 3 kg of force. It was confirmed that none.

본 발명의 실시예에 의해 제조된 반사필름과 종래의 제품을 비교하여 표 1과 같은 결과를 얻을 수 있었다. Comparing the reflective film produced by the embodiment of the present invention and the conventional product it was possible to obtain the results shown in Table 1.

Figure 112006090106073-PAT00004
Figure 112006090106073-PAT00004

본 발명의 실시예에 의한 반사필름의 유해성 물질(중금속)의 검출 여부를 시험하여 표 2와 같은 결과를 얻을 수 있었다.Test results of the detection of harmful substances (heavy metals) of the reflective film according to the embodiment of the present invention was able to obtain the results shown in Table 2.

Figure 112006090106073-PAT00005
Figure 112006090106073-PAT00005

이상에서 설명한 바와 같이, 본 발명의 은 반사필름 및 그 제조방법은 종래의 진공증착방법 및 그라비아 인쇄 코팅방법의 단점을 극복하는 효과를 얻을 수 있다.As described above, the silver reflective film of the present invention and its manufacturing method can obtain the effect of overcoming the disadvantages of the conventional vacuum deposition method and gravure printing coating method.

즉, 본 발명에 의하면 기재에 안착되는 은(Ag)막을 일정하게 형성할 수 있고, 종래기술에 의한 핀홀 현상을 제거할 수 있으며, 결과적으로 제품의 반사특성을 향상시키는 효과를 얻을 수 있다.That is, according to the present invention, the silver (Ag) film deposited on the substrate can be formed constantly, the pinhole phenomenon according to the prior art can be eliminated, and as a result, the effect of improving the reflection characteristics of the product can be obtained.

또한, 본 발명에 의하면 제조공정을 단순화하고 용이하게 실현하여, 생산성을 향상시킬 수 있으며, 제조 비용을 절감시키는 효과를 얻을 수 있다.In addition, according to the present invention, the manufacturing process can be simplified and easily realized to improve productivity, and the manufacturing cost can be reduced.

따라서, 본 발명의 은 반사필름은 액정표시소자 및 조명용으로 유용하게 이용할 수 있으며, 더욱 건축자재 등과 같이 산업 전반에 고루 적용할 수 있는 것이다.Therefore, the silver reflective film of the present invention can be usefully used for liquid crystal display devices and lighting, and can be applied evenly throughout the industry, such as building materials.

Claims (6)

기재로 사용되는 PET필름; PET film used as a base material; 그 상부에 부착성 향상을 위해 도포 형성되는 전처리막; A pretreatment film coated on the upper portion to improve adhesion; 상기 전처리막의 표면을 코로나방전 처리하여 얻어지는 미세 요철면; Fine uneven surface obtained by corona discharge treatment of the surface of the pretreatment membrane; 상기 요철면의 상부에 광반사를 위해 액상 분사식으로 도포 형성되는 은막; A silver film coated on the upper surface of the uneven surface by liquid injection for light reflection; 상기 은막을 보호하기 위해 도포 형성되는 변색방지막; 그리고 Discoloration preventing film is formed to protect the silver film; And 상기 변색방지막의 상부에 도포 형성되는 상보호막을 포함하여 이루어지는 은 반사필름.Silver reflecting film comprising an upper protective film is formed on top of the discoloration prevention film. 제 1 항에 있어서, 전처리막은 폴리우레탄계, 에폭시계 또는 변성아크릴계 도료 중에서 하나를 선택하여 도포 형성하여 얻어진 것임을 특징으로 하는 은 반사필름.The silver reflecting film according to claim 1, wherein the pretreatment film is obtained by coating and forming one of a polyurethane, an epoxy or a modified acrylic paint. 제 1 항에 있어서, 상보호막은 폴리우레탄계, 에폭시계 및 변성아크릴계 수지를 주성분으로 하여 혼합된 투명도료를 도포 형성하여 얻어진 것임을 특징으로 하는 은 반사필름.The silver reflective film according to claim 1, wherein the upper protective film is obtained by coating and forming a mixed transparent paint containing as a main component polyurethane, epoxy and modified acrylic resins. 롤투롤방식으로 플라즈마 발생장치를 통과시키면서 PET필름의 표면 이물질을 제거하는 단계;Removing foreign substances on the surface of the PET film while passing the plasma generator in a roll-to-roll manner; PET필름의 상면에 폴리우레탄계, 에폭시계 또는 변성아크릴계 투명도료 중에서 하나를 선택하여 분사 도포하고, 건조로를 통과시켜 전처리막을 형성하는 단계;Spray coating by selecting one of the polyurethane, epoxy, or modified acrylic transparent paint on the upper surface of the PET film, and passing the drying furnace to form a pretreatment film; 연속하여 코로나방전장치를 거쳐 전처리막의 표면에 미세 요철면을 형성하는 단계; 그리고 Continuously forming a fine concavo-convex surface on the surface of the pretreatment film via a corona discharge device; And 연속 공정으로 요철면의 표면에 질산은과 환원액을 동시에 분사하여 은경반응에 의한 은이 석출되도록 하고, 세척, 수분 제거 및 건조시켜 은막을 형성하는 단계;Simultaneously spraying silver nitrate and a reducing solution on the surface of the uneven surface in a continuous process to precipitate silver by a silver diameter reaction, and washing, removing water, and drying to form a silver film; 로 이루어짐을 특징으로 하는 은 반사필름의 제조방법.Method for producing a silver reflective film, characterized in that consisting of. 제 4 항에 있어서, 상기 은막의 상부에 투명도료를 도포 건조하여 변색방지막을 형성하는 단계: 그리고The method of claim 4, wherein the transparent coating is applied to the upper portion of the silver film to form a color change preventing film: And 상기 변색방지막의 상부에 폴리우레탄계, 에폭시계 및 변성아크릴계 수지를 주성분으로 하여 혼합된 투명도료를 도포하고, UV경화장치를 통과시켜 상보호막을 형성하는 단계;Forming a top protective film on top of the discoloration prevention film by applying a mixed transparent paint based on polyurethane, epoxy and modified acrylic resins and passing through a UV curing device; 를 더 포함하여 이루어짐을 특징으로 하는 은 반사필름의 제조방법.Method for producing a silver reflecting film, characterized in that further comprises a. 제 5 항에 있어서, 상보호막용 투명도료는 변성 폴리우레탄 수지 15중량%와, 아미노 수지 5중량%, 그리고 변성 아크릴 수지 10중량% 및 인산계 촉매 0.5~1중량%를 포함하며, 케톤, 에틸 아세테이트, 톨루엔을 용제로 사용하고, 고형분은 20~40%의 범위로 혼합하여 제조한 것임을 특징으로 하는 은 반사필름의 제조방법.The transparent coating for the upper protective film of claim 5 comprises 15% by weight of a modified polyurethane resin, 5% by weight of an amino resin, 10% by weight of a modified acrylic resin and 0.5 to 1% by weight of a phosphoric acid catalyst, and includes ketone and ethyl. A method of producing a silver reflective film, characterized in that the acetate and toluene are used as a solvent, and the solid content is prepared by mixing in a range of 20 to 40%.
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KR100946862B1 (en) * 2009-05-18 2010-03-09 주식회사 디온지씨 Silver coating screen and method of manufacturing of the same
US9081132B2 (en) 2011-02-01 2015-07-14 Toray Advanced Materials Korea Inc. Adhesive film for a reflection sheet and reflection sheet using the same
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KR100946862B1 (en) * 2009-05-18 2010-03-09 주식회사 디온지씨 Silver coating screen and method of manufacturing of the same
US9081132B2 (en) 2011-02-01 2015-07-14 Toray Advanced Materials Korea Inc. Adhesive film for a reflection sheet and reflection sheet using the same
KR101656461B1 (en) * 2015-07-02 2016-09-09 성지산업 주식회사 Reflection film based on silver nano layer produced by wet coating and production method thereby
KR20180124237A (en) * 2017-05-11 2018-11-21 엘지전자 주식회사 Micro Mirror Array and Manufacturing Method Thereof
KR20200019498A (en) * 2018-08-14 2020-02-24 코리아 오토글라스 주식회사 Laminated glass, method for manufacturing therof and laminated glass module

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