KR20030063670A - The top coating method using of paints being cured by ultraviolet rays - Google Patents
The top coating method using of paints being cured by ultraviolet rays Download PDFInfo
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- KR20030063670A KR20030063670A KR1020020003907A KR20020003907A KR20030063670A KR 20030063670 A KR20030063670 A KR 20030063670A KR 1020020003907 A KR1020020003907 A KR 1020020003907A KR 20020003907 A KR20020003907 A KR 20020003907A KR 20030063670 A KR20030063670 A KR 20030063670A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/005—Curtain coaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
- B05D1/305—Curtain coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2508/00—Polyesters
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- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
본 발명은 자외선 경화형 도료를 이용한 마감 코팅 방법에 관한 것으로, 더 자세하게는 피도장체의 표면에 금속과 같은 특이한 질감을 부여하거나 피도장체 표면 그대로의 질감을 유지시키기 위한 피도장체 표면의 베이스 코팅층이 오염되거나 손상되는 것을 방지하기 위하여 베이스 코팅층 표면에, 폴리에스테르계 또는 에폭시 폴리에스테르계 수지로 이루어진 분말상의 분체도료로서 중간 접착체의 역할도 수행하는 투명수지층을 형성시키고, 이 투명수지층의 표면에 자외선 경화형 도료로서 마감층을 피복시키는, 자외선 경화형 도료를 이용한 마감 코팅 방법에 관한 것이다.The present invention relates to a finish coating method using an ultraviolet curable paint, and more particularly, to provide a specific texture such as a metal on the surface of the object or to maintain a texture of the surface of the object as it is. In order to prevent contamination or damage, a transparent resin layer is formed on the surface of the base coating layer as a powder powder coating made of polyester or epoxy polyester resin and also serves as an intermediate adhesive. The present invention relates to a finish coating method using an ultraviolet curable paint, which coats a surface with a finish layer as an ultraviolet curable paint.
각 종 건축 내·외장재용으로 사용되고 있는 각종 금속 외장품 표면에는, 특정한 색감, 질감, 문양 등을 표현하기 위하여 도장, 도금, 전사, 인쇄, 에칭, 실크 스크린 등의 다양한 기술로 표현되는 인쇄층(또는 도장층 등)인 표면 베이스 코팅층이 피복된다.On the surface of various metal exterior items used for interior and exterior materials of various constructions, printed layers expressed by various techniques such as painting, plating, transfer, printing, etching, and silk screen to express specific colors, textures, and patterns ( Or a surface base coating layer, such as a coating layer).
따라서, 금속 외장재의 미관을 유지하기 위하여서는 베이스 코팅층 표면이 다양한 외적 요인들에 의한 오염되거나, 타 물체와의 접촉에 의해 발생되는 스크래치와 같은 표면 흠집으로 손상되는 것을 방지하여야만 하며, 이를 위하여 금속 외장재의 베이스 코팅층 표면에 투명수지층을 피복하는 것이 일반적이다.Therefore, in order to maintain the aesthetic appearance of the metal cladding, the surface of the base coating layer should be prevented from being damaged by surface damage such as scratches caused by contact with other objects or contamination by various external factors. It is common to coat the transparent resin layer on the surface of the base coating layer.
상기와 같이 베이스 코팅층의 오염 방지와 보호를 위하여 그 표면에 필수적으로 피복되는 상기 투명수지층은, 종래에는 용제 희석형 분무 방식에 의한 마감 코팅 작업으로 형성시키는 것이 일반적이었다.As described above, the transparent resin layer, which is essentially coated on the surface of the base coating layer to prevent contamination and protection, was conventionally formed by a finish coating operation using a solvent dilution spray method.
그러나, 상기의 용제 희석형 분무 작업에 의해 형성되는 투명수지층 표면에는 도료가 분사 될 때 발생되는 귤 껍질 같은 표면의 굴곡이 나타나는 오렌지 필(orange peel) 현상이 발생되어 오히려 표면 품질을 떨어뜨리고, 베이스 코팅층에 표현된 입체감을 저하시키게 되는 문제가 있다.However, on the surface of the transparent resin layer formed by the solvent dilution spraying operation, an orange peel phenomenon occurs, in which a curvature of the surface, such as a tangerine peel, generated when the paint is sprayed, deteriorates the surface quality. There is a problem of reducing the three-dimensional feeling expressed on the base coating layer.
따라서, 상기 투명수지층의 표면 굴곡을 최소화하기 위하여 수회에 걸쳐 표면 연마 작업과 병행한 마감 코팅을 실시하기도 하나, 이러한 작업은 마감 코팅 작업의 작업 부하와 생산성을 지나치게 떨어뜨리게 된다.Therefore, in order to minimize the surface curvature of the transparent resin layer may be subjected to a finish coating in parallel with the surface polishing operation several times, this operation will drop the work load and productivity of the finish coating operation excessively.
또한, 베이스 코팅층 표면에 피복되는 마감층인 상기 투명코팅층은 그 두께가 수 미크론에서 수십 미크론 정도로 매우 얇게 피복되기 때문에 오염 방지 역할을 수행하기는 하나, 보호 코팅층으로서의 역할이 불충분하여 베이스 코팅층이 쉽게 손상되는 단점이 있다.In addition, the transparent coating layer, which is a finishing layer coated on the surface of the base coating layer, serves to prevent contamination because the thickness thereof is very thin, such as several microns to several tens of microns, but the role of the protective coating layer is insufficient, and thus the base coating layer is easily damaged. There is a disadvantage.
상기와 같이 베이스 코팅층을 보호하기 위한 역할이 불충분한 투명수지층의 단점을 보완하기 위하여 투명수지층의 표면에 자외선 경화형 도료로 이루어진 마감층을 피복할 수도 있으나, 종래 투명수지층의 두께가 너무 얇아 베이스 코팅층과 마감층 사이에서 투명수지층이 접착제로서의 역할을 수행할 수 없다.In order to compensate for the disadvantages of the transparent resin layer having insufficient role for protecting the base coating layer as described above, the surface of the transparent resin layer may be coated with a finish layer made of UV curable paint, but the thickness of the conventional transparent resin layer is too thin The transparent resin layer cannot serve as an adhesive between the base coating layer and the finishing layer.
또한, 상기 투명수지층의 분무 및 건조시 투명수지층의 표면이 평활하게 형성되도록 하기 위하여 종래의 투명수지에는 레벨링 조제가 통상 1.5∼3.0wt% 정도 함유되는 바, 마감층 형성 완료 후 시간이 경과함에 따라 상기 레벨링 조제가 마감층과 투명수지층의 분리를 오히려 촉진시키게 되는 문제가 있다.In addition, in order to ensure that the surface of the transparent resin layer is smoothly formed when spraying and drying the transparent resin layer, the conventional transparent resin typically contains about 1.5 to 3.0 wt% of a leveling aid, and after the completion of the finishing layer, the time has elapsed. As a result, the leveling aid has a problem of facilitating separation of the finishing layer and the transparent resin layer.
상기와 같이 베이스 코팅층에 투명수지층을 피복하는 종래의 방법이 갖는 문제점을 해결하기 위하여 본 출원인은 자외선 경화형 투명수지층을 이용한 고광택 마감 도장 방법(특허 제0292257호)을 개발하였다.In order to solve the problems of the conventional method of coating the transparent resin layer on the base coating layer as described above, the applicant has developed a high-gloss finish coating method using a UV-curable transparent resin layer (Patent No. 0292257).
그러나, 상기 방법은 베이스 코팅층의 표면에 자외선 경화형 투명수지층을 피복시키되, 상기 투명수지층과 베이스 코팅층 사이의 결합력을 높이기 위하여 베이스코팅층의 표면에 아이솔레이트 코팅층을 피복하고, 이 아이솔레이트 코팅층의표면에 자외선 경화형 투명수지층을 형성시키는 방법으로, 아이솔레이트 코팅액이 에폭시 또는 우레탄 수지계이기 때문에 80℃ 이상의 온도에서 열에 의한 황변이 발생되고, 자외선 등의 빛에 아주 약한 단점을 지니고 있다.However, the method is to coat the UV curable transparent resin layer on the surface of the base coating layer, in order to increase the bonding force between the transparent resin layer and the base coating layer is coated with an isolate coating layer on the surface of the base coating layer, this isolate coating layer As a method of forming a UV-curable transparent resin layer on the surface, since the isolate coating liquid is an epoxy or urethane resin, yellowing occurs due to heat at a temperature of 80 ° C. or higher, and has a very weak disadvantage in light such as ultraviolet rays.
그리고, 투명수지층의 건조 과정 중 적외선 건조 구간인 40~50℃ 범위에서 휘발분이 급격히 증발하므로써 핀홀 등이 발생될 수 있어 외관 결함의 원인이 되는 문제가 있으며, 상기 아이솔레이트 코팅층과 마감층과의 결합력을 높이기 위하여 아이솔레이트 코팅층 표면의 이물질 제거와 표면 조도 조절을 위한 연마 작업이 필요하기 때문에 작업 시간이 오래걸리고 작업 부하가 증가하는 문제가 있다.In addition, since the volatiles rapidly evaporate in the infrared drying range of 40 to 50 ° C. during the drying process of the transparent resin layer, pinholes may be generated, thereby causing appearance defects. In order to increase the bonding force of the isolate coating layer is required to remove the foreign material and polishing to adjust the surface roughness, so the work takes a long time and the work load increases.
본 발명은 금속 외장재 표면의 베이스 코팅층 보호를 위한 종래의 마감 코팅 방법이 갖고 있는 제반 문제점들을 해결하기 위한 것으로, 베이스 코팅층의 보호에 충분한 두께의 투명수지층을 형성시켜 외장재의 수명을 연장시키는 동시에, 자외선 경화형 마감층과의 결합력이 보장되며, 연마 작업을 생략할 수 있도록 하므로써 작업 부하를 감소시킬 수 있는 커튼 코팅 방법으로 마감층을 피복하는 자외선 경화형 도료를 이용한 마감 코팅 방법을 제공함에 본 발명의 목적이 있다.The present invention is to solve the problems of the conventional finish coating method for protecting the base coating layer on the surface of the metal cladding, to form a transparent resin layer of sufficient thickness to protect the base coating layer to extend the life of the packaging material, It is an object of the present invention to provide a finish coating method using an ultraviolet curable paint that coats the finish layer with a curtain coating method that can reduce the work load by ensuring the bonding force with the ultraviolet curable finish layer and can eliminate the grinding work. There is this.
도 1은 본 발명 방법의 공정 흐름도.1 is a process flow diagram of the method of the present invention.
도 2는 본 발명 방법에 의해 마감 코팅된 외장재의 단면 모식도.Figure 2 is a schematic cross-sectional view of the finish coating the exterior material by the method of the present invention.
((도면의 주요 부분에 대한 부호의 설명))((Explanation of symbols for main part of drawing))
11. 소재 12. 베이스 코팅층11.Material 12. Base coating layer
13. 투명수지층 14. 마감층13. Transparent resin layer 14. Finishing layer
본 발명의 상기 목적은 투명수지로 이루어진 분말상의 분체도료에 의하여 달성된다.The above object of the present invention is achieved by a powder powder coating made of a transparent resin.
본 발명의 마감 코팅 방법을 달성하기 위하여 베이스층의 표면에 피복되어 자외선 경화형 도료로 이루어진 마감층과의 접착제 역할도 수행하게 되는 투명수지층이 상기 투명수지 분체도료로 형성되며, 이 분체도료는 폴리에스테르계 또는 에폭시 폴리에스테르계 중의 하나로 이루어진 투명수지이다.In order to achieve the finish coating method of the present invention, a transparent resin layer which is coated on the surface of the base layer and also serves as an adhesive with a finish layer made of UV curable paint is formed of the transparent resin powder coating, and the powder coating is made of poly It is a transparent resin which consists of either ester type or epoxy polyester type.
본 발명의 방법은 베이스 코팅층의 표면에 피복되는 상기 투명수지층을 분체도장법으로 형성시킴에 그 기술적 특징이 있으며, 실내에 사용될 경우에는 에폭시 폴리에스테르계를, 실외에 사용되는 경우에는 내후성이 우수한 폴리에스테르계 수지를 적용하는 것이 바람직하다.The method of the present invention has a technical feature in forming the transparent resin layer coated on the surface of the base coating layer by a powder coating method, an epoxy polyester-based when used indoors, and a weather-resistant poly when used outdoors It is preferable to apply ester resin.
그리고, 분체도장에 의해 베이스 코팅층의 표면에 피복되는 상기 투명수지층은 용제 분무식 방법과 달리 후(厚)도장이 가능하며, 본 발명에서는 50∼200㎛ 범위의 두께로 피복시킨다.In addition, the transparent resin layer coated on the surface of the base coating layer by powder coating can be post-painted, unlike the solvent spray method, and is coated with a thickness in the range of 50 to 200 μm in the present invention.
상기와 같이 투명수지층의 두께를 제한하는 것은, 그 두께가 50㎛에 미치지 못하면 베이스 코팅층과 마감층 사이의 접착력이 약하고, 200㎛을 초과하게 되면 내충격성이 떨어져 충격에 의한 파손 위험이 증가하게 되기 때문이다.Limiting the thickness of the transparent resin layer as described above, if the thickness is less than 50㎛ the adhesion between the base coating layer and the finishing layer is weak, and if it exceeds 200㎛ the impact resistance is lowered to increase the risk of damage due to impact Because it becomes.
그리고, 상기 투명수지층을 형성하는 상기 폴리에스테르계 또는 에폭시 폴리에스테르계의 투명수지에는, 분체도장시 투명수지 분말이 용융되어 투명수지층을 형성하는 과정에서 투명수지층의 표면이 매끄럽게 되도록 레벨링 조제가 첨가되나, 투명수지층은 베이스 코팅층의 보호와 더불어 자외선 경화형 도료로 피복되는 마감층과 베이스 코팅층 사이의 접착력을 높여주기 위한 접착제의 기능도 하게 되는 바, 상기 레벨링 조제의 함량이 투명수지 전체 중량의 0.5중량%를 초과하게 되면투명수지층이 오히려 마감층의 분리를 촉진하게 되고, 0.1중량%에 미치지 못하면 레벨링 조제의 첨가 효과가 없게 됨을 유의하여야 한다.In the transparent resin of the polyester or epoxy polyester forming the transparent resin layer, the transparent resin powder is melted during powder coating so that the surface of the transparent resin layer becomes smooth in the process of forming the transparent resin layer. Is added, but the transparent resin layer also serves as an adhesive to increase the adhesion between the base coating layer and the finishing layer coated with the UV curable paint, together with the protection of the base coating layer, and the content of the leveling aid is the total weight of the transparent resin. It should be noted that if the content of more than 0.5% by weight of the transparent resin layer will facilitate the separation of the finishing layer, if less than 0.1% by weight, the effect of the addition of the leveling aid will be ineffective.
상기 본 발명의 목적과 기술적 구성을 비롯한 그에 따른 작용 효과에 관한 자세한 사항은 본 고안의 바람직한 실시예를 도시하고 있는 도면을 참조한 아래의 설명에 의해 명확하게 이해될 것이다.Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.
도 1에 본 발명 자외선 경화형 도료를 이용한 마감 코팅 방법의 공정 흐름도를, 도 2에 본 발명 방법에 의해 마감 코팅된 외장재의 단면 모식도를 도시하였다.The process flow chart of the finishing coating method using the ultraviolet curable coating material of this invention in FIG. 1 was shown the cross-sectional schematic diagram of the exterior material which finish-coated by the method of this invention in FIG.
도시된 바와 같이, 금속 외장재(11)의 표면에 요구되는 색감, 질감, 문양 등이 표현되는 베이스 코팅층(12)을 형성시키는 단계(100)와; 베이스 코팅층(12)의 불규칙한 돌기들을 제거하고 적절한 표면 조도를 부여하기 위하여 베이스 코팅층(12)의 표면을 연마하는 단계(200)와; 상기 연마된 베이스 코팅층(12)의 표면에 분체도장법으로 투명수지층(13)을 피복하는 단계(300)와; 투명수지층(13)의 표면에 자외선 경화형 도료를 도포하는 단계(400)와; 투명수지층(13) 표면에 도포된 자외선 경화형 도료를 상온 중에서 5∼20분 자연 건조시키는 단계(500)와; 자외선 경화형 도료를 자외선 건조로에서 완전히 건조시켜 최종 마감층(14)을 형성시키는 단계(600)로 이루어진다.As shown, step (100) of forming a base coating layer 12 on the surface of the metal packaging material 11, the color, texture, pattern, etc. required; Polishing (200) the surface of the base coating layer (12) to remove irregular protrusions of the base coating layer (12) and to impart proper surface roughness; Coating (300) the transparent resin layer (13) on the surface of the polished base coating layer (12) by powder coating; Coating (400) an ultraviolet curable paint on the surface of the transparent resin layer (13); A step of naturally drying the UV-curable paint applied to the transparent resin layer 13 at room temperature for 5 to 20 minutes (500); The ultraviolet curable paint is completely dried in an ultraviolet drying furnace to form a final finishing layer 14 (600).
그리고, 상기 자외선 경화형 도료는 분무식 방법으로 도포되어도 관계 없으나, 분무식 도장에서 발생되는 오렌지 필 현상을 방지하기 위하여서는 커튼 코터(curtain coater)에 의한 커튼 코팅 방식으로 마감층을 피복하는 것이 바람직하다.In addition, the UV curable paint may be applied by a spray method, but in order to prevent the orange peel phenomenon generated by spray coating, it is preferable to coat the finish layer by a curtain coating method by a curtain coater. .
즉, 커튼 코팅 방식으로 형성된 마감층에는 분무식 방법으로 코팅된 표면에 나타나는 오렌지 필 현상이 발생되지 않는 특징이 있다.That is, the finish layer formed by the curtain coating method has a feature that does not occur orange peel phenomenon appearing on the surface coated by the spray method.
그리고, 본 발명 방법에 사용되는 투명수지층은 분말상의 분체도료를 사용하여 피복되는 바, 용제형 코팅액에 비하여 코팅 두께를 두껍게 할 수 있어 베이스 코팅층에 대한 보호 역할이 충분할 뿐 아니라 코팅 품질도 우수하다.In addition, the transparent resin layer used in the method of the present invention is coated with a powdery powder coating, which can thicken the coating thickness as compared to the solvent type coating liquid, and not only has a sufficient protective role for the base coating layer but also excellent coating quality. .
또한, 자외선 경화형 도료를 자외선 건조전 상온에서 5~20분 정도 자연 건조시키는 것은 자외선 경화형 도료가 완전히 건조되기전 도막의 레벨링이 충분히 이루어지도록 하기 위해서이다.In addition, the natural drying of the ultraviolet curable paint at room temperature for 5 to 20 minutes before drying the ultraviolet ray is to sufficiently level the coating film before the ultraviolet curable paint is completely dried.
이상에서 살펴본 바와 같이, 본 발명의 자외선 경화형 도료를 이용한 마감 코팅 방법은 분체도장되는 투명수지층의 두께가 두꺼워 베이스 코팅층 보호 효과가 뛰어나며, 상기 투명수지층은 베이스 코팅층과 마감층 모두에 우수한 부착력을 가짐에 따라 외장재의 수명이 연장되고, 마감층이 자외선 경화형 도료로 이루어져 표면의 내구성, 광택, 내오염성 등이 우수하고, 마감층의 신속한 경화에 의하여 생산성을 현저히 향상되는 장점이 있다.As described above, the finish coating method using the UV-curable paint of the present invention is excellent in the protective effect of the base coating layer because the thickness of the transparent resin layer is powder coating, the transparent resin layer has excellent adhesion to both the base coating layer and the finishing layer As the life of the exterior material is extended, and the finishing layer is made of UV curable paint, the surface has excellent durability, gloss, stain resistance, and the like, and there is an advantage of significantly improving productivity by rapid curing of the finishing layer.
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