KR0180864B1 - Hot-dip zn coated color steel sheet and its manufacturing method - Google Patents
Hot-dip zn coated color steel sheet and its manufacturing method Download PDFInfo
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- KR0180864B1 KR0180864B1 KR1019960019652A KR19960019652A KR0180864B1 KR 0180864 B1 KR0180864 B1 KR 0180864B1 KR 1019960019652 A KR1019960019652 A KR 1019960019652A KR 19960019652 A KR19960019652 A KR 19960019652A KR 0180864 B1 KR0180864 B1 KR 0180864B1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
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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
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
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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
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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Abstract
본 발명은 0.12∼0.18중량% Al, 99.88∼99.82중량% Zn 을 함유하는 합금도금을 피복한 도금강판의 외관에 입체감을 부여하여 기존 제품의 단조로움을 탈피하고 일반 PCM 도장강판보다 가공성 및 내식성을 향상시킨 새로운 감각의 도장강판에 관한 것으로, 그의 주요구성을 소지강판(1)과 그 위에 도금하는 18∼23㎛ 의 0.12∼0.18중량% Al, 99.88∼99.82중량% Zn 합금도금층(2)과, 합금도금층(2) 위에 크롬산염 처리를 한 크롬산염층(3)와, 크롬산염층(3) 상에 형성시킨 플렉서블폴리에스테르 도막층(4, 5)으로 이루어지는 용융아연도금강판이다.The present invention relates to a method for producing a coated steel sheet coated with an alloy plating containing 0.12 to 0.18% by weight of Al and 99.88 to 99.82% by weight of Zn, thereby imparting a three-dimensional effect to the appearance of the coated steel sheet, (1) and 0.1 to 0.18 wt% of Al, 99.88 to 99.82 wt% of Zn alloy plating layer (2) of 18 to 23 탆 which is plated on the base steel sheet (1) Plated steel sheet comprising a chromate layer 3 which is chromate treated on an alloy plating layer 2 and a flexible polyester coating layer 4 and 5 which are formed on a chromate layer 3.
또한 본 발명의 제조방법은 0.12∼0.18중량% Al, 99.88∼99.82중량% Zn 로 이루어지는 455∼465℃ 의 합금용융도금 욕조내에 강판을 통과시켜 에어와이핑법에 의해 도금 피복량을 조절하여 도금처리하는 공정과 롤코팅 방법을 사용하여 얇은 박막으로 도포한 후 60∼140℃ 온도 조건에서 건조시켜 20∼80㎎/㎡ 의 크롬산염층(3)으로 형성시키는 크롬산염처리 공정과 그리고 플렉서블폴리에스테르 도료를 롤코팅한후 210∼241℃ 로 가열하여 건조시킨 플렉서블 도막층(프라이마 및 상도 2층)(4, 5)의 도장공정과, 엠보스롤로서 최종 압파처리되어 무늬가 형성되는 압하공정으로 이루어지는 것을 특징으로 한다.Further, the manufacturing method of the present invention is characterized in that a steel sheet is passed through a hot-dip galvanizing bath of 455-465 ° C made of 0.12-0.18% by weight of Al and 99.88-99.82% by weight of Zn to adjust the plating coverage amount by air wiping A chromate treatment process of forming a chromate layer (3) of 20 to 80 mg / m < 2 > by drying at a temperature of 60 to 140 < 0 > C and applying a flexible polyester paint A coating step of a flexible coating film layer (primer and upper two layers) 4 and 5 which is heated and dried at 210 to 241 ° C after roll coating, and a pressing down step in which final embossing is performed to form a pattern as an emboss roll .
Description
제1도는 본 발명에 따른 용융아연도금 칼라강판의 피복상태를 도시하는 피복층 확대단면도.FIG. 1 is an enlarged cross-sectional view of a coating layer showing a coated state of a hot-dip galvanized steel sheet according to the present invention. FIG.
* 도면의 주요부분에 대한 부호의 설명DESCRIPTION OF THE REFERENCE NUMERALS
1 : 소지강판층 2 : 합금도금층1: base steel sheet layer 2: alloy plating layer
3 : 크롬산염층 4, 5 : 프라이마층 및 상도층3: Chromate layer 4, 5: Prime layer and upper layer
본 발명은 표면에 아연을 용융도금한 강판에서 그 상층에 부식방지를 위해 도포형 크롬산염처리를 하고, 그 상층에 기능성을 부여하는 플렉서블 폴리에스테르(flexible polyester) 도료를 도장처리한 후, 강판에 무늬형태의 입체감을 부여하기 위하여 무늬가 새겨진 금속롤(이하 엠보스롤이라 함)로써 압하 처리한 용융아연도금 칼라강판 및 그의 제조방법에 관한 것이다.The present invention relates to a steel sheet obtained by hot-dipping zinc on the surface thereof, a coating chromate treatment for preventing corrosion on the upper layer thereof, a coating of a flexible polyester paint for imparting functionality to the upper layer, (Hereinafter referred to as an emboss roll) in order to impart a three-dimensional effect in the form of a pattern, and a method of manufacturing the same.
현재 사용되어지고 있는 용융아연 도금강판은 아연의 철에 대한 희생방식 효과가 크고 비교적 저가로 제조될 수 있다는 이유에서 내식성을 위한 표면처리 강판으로 많이 사용되고 있다.The currently used hot-dip galvanized steel sheet is widely used as a surface-treated steel sheet for corrosion resistance because the effect of sacrificing the zinc of iron is large and can be manufactured at relatively low cost.
예로써, 건축구조용재 및 도장하지용 표면처리강판으로 사용되어 왔으며, 이는 아연과 철의 합금층에 의하여 내식성이 뛰어난 것으로 알려져 있다.For example, it has been used as structural structural materials and surface-treated steel plates for coatings, and it is known to have excellent corrosion resistance due to the alloy layer of zinc and iron.
그러나 용융아연 도금강판 자체는 롤이나 프레스 성형시, 금형과의 윤활성이 나빠 도금층이 벗겨지거나 마찰에 의해 소지강판 및 금형의 표면손상을 가져오는 등의 단점이 있다.However, the hot-dip galvanized steel sheet itself has drawbacks such as peeling off of the plating layer due to poor lubrication with the mold during roll or press forming, or surface damage of the base steel sheet and the mold due to friction.
이와 같은 결점을 보완하기 위하여, 통상 도금강판 표면에 일반 PCM(Pre-coated metal)용 도료를 도포하여 가공성을 부여하고 있으나, 용융아연도금강판 및 도료자체의 기능성 저하로 큰 효과가 없다.In order to overcome such drawbacks, the usual PCM (Pre-coated metal) paint is applied to the surface of the coated steel sheet to impart processability, but the function of the hot-dip galvanized steel sheet and the paint itself is not greatly reduced.
그리고 가공후에도 가공부분의 미세한 크랙으로 인하여 내식성이 떨어지는 등의 단점이 있다.And there is a disadvantage that corrosion resistance is lowered due to a minute crack in the machined portion even after the machining.
근래에는 상기한 문제점들을 보완하기 위하여 용융아연도금강판 위에 기능성을 부여한 PCM(Pre-coated metal)용 도료, 예를들면, 불소도료나 실리콘 폴리에스테르 등을 도포하여 가공성을 높인 제품도 있으나 가격측면에서 고가인 관계로 일반 건축자재용으로 사용하기에는 무리가 있었다.In recent years, in order to overcome the above-mentioned problems, there has been proposed a PCM (Pre-coated metal) coating material imparting functionality on a hot-dip galvanized steel sheet, for example, a fluorine coating material or a silicone polyester, Because it is expensive, it was difficult to use it for general building materials.
본 발명은 상기한 문제점들을 감안하여 안출한 것으로, 본 발명의 목적은 용융아연 도금강판에 플렉서블 폴리에스테르 도료를 도장하여, 우수한 도장작업성 및 내식성을 갖도록 하고, 또한 뛰어난 가공성으로 성형가공시 강판표면에 대한 손상을 줄이도록 하였다.SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of coating a hot-dip galvanized steel sheet with a flexible polyester paint, To reduce the damage to.
또한 도막 외면을 엠보스(emboss)롤로써 도금강판을 압하처리하여 기존의 평활한 강판의 표면상태에서 입체적이고 변화가 있는 강판 표면상태를 부여하여 기능성 및 외장성등이 우수한 도장처리 강판의 제조를 목적으로 한다.In addition, the coated steel sheet is subjected to a rolling process by an emboss roll on the outer surface of the coated film to give a three-dimensional and varied surface state of the steel sheet in the surface state of the conventional smooth steel sheet, thereby manufacturing a coated steel sheet excellent in functionality and exteriors The purpose.
이하, 본 발명을 더욱 구체적으로 설명한다.Hereinafter, the present invention will be described more specifically.
본 발명에 따른 용융아연도금 칼라강판의 제조 방법은 0.12∼0.18% Al, 99.88∼99.82% Zn 로 이루어지는 합금용융 도금욕조 내에 일반강판을 통과시켜 에어와이핑법에 의해 도금피복량을 조절하여, 소지강판층(1) 상에 소지철에서 부터 γ(Fe3Zn10), δ(FeZn7), ζ(FeZn13), η(순수 Zn) 상의 합금도금층(2)이 18∼23㎛ 이 되도록 합금 도금처리 한다.The method for manufacturing a hot-dip galvanized steel sheet according to the present invention comprises the steps of passing a general steel sheet through a hot-dip galvanizing bath consisting of 0.12 to 0.18% Al and 99.88 to 99.82% Zn to regulate the coating amount of coating by air wiping, An alloy plating process is performed on the layer 1 so that the alloy plating layer 2 on? (Fe3Zn10),? (FeZn7),? (FeZn13), and? (Pure Zn)
이때 도금욕조의 온도는 섭씨 455∼465도가 적당하다.At this time, the temperature of the plating bath is suitably in the range of 455 to 465 degrees Celsius.
그 위에 크롬산염 처리를 롤코팅 방식으로 표면에 얇은 막을 도포하여 섭씨 60-140도 온도조건에서 건조시켜 20-80㎎/㎡ 의 크롬산염층(3)을 형성시키고, 그 위에 플렉서블 폴리에스테르 도막층을 형성시킨다.A chromate treatment is applied on the surface by a roll coating method, and the coating is dried at a temperature of 60-140 DEG C to form a chromate layer 3 of 20-80 mg / m < 2 >, and a flexible polyester coating layer .
플렉서블 폴리에스테르 도막층은 하도, 상도 2층 구조로 이루어진다.The flexible polyester coating film layer has a two-layered structure of both upper and lower layers.
하도인 프라이마층(4)은 건조도막두께 3∼7㎛, 바람직하기로는 5㎛로 한다.The primer layer 4 has a dry film thickness of 3 to 7 mu m, preferably 5 mu m.
프라이마층(4)의 두께가 7㎛ 이상일 경우엔 부착성이 떨어진다.If the thickness of the primer layer 4 is 7 탆 or more, adhesion is deteriorated.
본 발명에 따른 프라이마층(4)은 폴리에스테르/우레탄 수지를 포함한다.The primer layer 4 according to the invention comprises a polyester / urethane resin.
그리고 상도층(5)은 18∼22㎛가 되도록 롤코팅 방식으로 도장한후, 드라이 오븐에서 롤코팅한 강판을 섭씨 210∼241℃ 로 가열하여 건조시킨다.The upper layer 5 is coated with a roll coating method so that the upper layer 5 is 18 to 22 탆, and then a steel sheet rolled in a dry oven is heated to 210 to 241 캜 and dried.
건조된 도장강판의 표면을 엠보스롤로서 최종 압하처리하면 본 발명의 제품이 완성된다.The finished product of the present invention is completed when the surface of the coated steel sheet which has been dried is finally subjected to a pressing process as an embossing roll.
한편, 용융아연 도금강판 상에 도포하는 PCM(Pre-coated metal)도료는 디프드로잉(deep drawing)이나 엠보싱 등의 가공을 행할시 나타나는 가공부위의 도막균열(크랙) 현상이 발생되지 않는, 즉 도막의 연신율이 우수한 신개발 PCM 도료를 사용하였다.On the other hand, the PCM (Pre-coated metal) paint applied on the hot-dip galvanized steel sheet is free from the coating film crack (crack) phenomenon occurring at the processing site when deep drawing or embossing is performed, Of the elongation of the PCM paint.
상술한 바와 같이, 플렉서블 폴리에스테르 도막층을 형성시키기 위한 도료는, 연합철강공업(주)와 고려화학에서 공동개발한 도료로서, 가혹조건의 가공시, 도막의 기능면에서 연신율을 최대로 부여한 선형 폴리에스테르 수지를 사용하였다.As described above, the coating material for forming the flexible polyester coating layer is a coating material jointly developed by Kunigi Kogyo Kogyo K.K. and Koryo Kagaku Co., Ltd. It is a coating material for forming a flexible polyester coating layer having a linear shape imparting the maximum elongation A polyester resin was used.
이와 관련된 원료의 선정 및 도료 제제의 일반적인 성질은 다음과 같다.The selection of raw materials and the general properties of the coating formulation are as follows.
[바인더의 선정][Selection of binder]
기존의 PCM 도료(레귤러 폴리에스테르)에 사용되는 수지는, 수지의 주쇄에 히드록실기, 카르복실기 등과 같은 작용기가 측쇄되어 있어, 도막의 가교제로 사용되는 멜라민(헥사-메톡시-메틸멜라민)수지와 가교성형시 망상구조를 갖게됨으로 도막 형성후에 도막의 연신이 극히 제한적이었다.The resin used in conventional PCM paints (regular polyesters) is composed of melamine (hexa-methoxy-methylmelamine) resin, which is used as a crosslinking agent for the coating film, in which a functional group such as a hydroxyl group or a carboxyl group is side- The stretching of the coating film after the formation of the coating film was extremely limited since it had a network structure during crosslinking molding.
이에 반하여 본 발명에서 사용하는 플렉서블 폴리에스테르 도료에 포함되는 수지(플렉서블 폴리에스테르수지)는, 수지의 주쇄가 선형구조가 되도록 알콜과 산 모노머를 특별히 선정하여 수지를 합성함으로서 가교반응후, 도막의 연신율과 내구력이 극대화되도록 하였다.On the contrary, in the resin (flexible polyester resin) contained in the flexible polyester paint used in the present invention, an alcohol and an acid monomer are specifically selected so that the main chain of the resin has a linear structure, and a resin is synthesized, And the durability was maximized.
즉, 고분자의 알콜을 사용하여, 측쇄작용기의 형성을 억제시켜 유연성을 부여하고, 자외선에 약한 에스테르(COO-)결합의 단위 체적당 수량을 줄여 내구력이 향상되도록 하였으며, 하드(경질)산(hard acid), 예로써, 테레프탈산을 사용하여 유연성 향상에 따른 도막의 경도저하를 보완하였다.That is, by using the alcohol of the polymer, it is possible to suppress the formation of the side chain functional groups to give flexibility, to improve the durability by decreasing the number of ester (COO-) bonds weak to ultraviolet rays per unit volume, acid, for example, terephthalic acid was used to compensate for the decrease in hardness of the coating film due to the improved flexibility.
[도료 배합상 PVC(pigment volumn content)의 조건][Condition of PVC (pigment volumn content) in coating composition]
또한 이러한 수지를 사용한 도료의 배합상으로는 증량제(체질안료계통) 사용을 억제하여, PVC(pigment volumn content : 안료의 체적량)를 하향조정하여 물리적인 유연성의 저하를 방지하였다.In addition, the use of an extender (extender pigment system) was suppressed in the formulation of the paint using such a resin, and the physical volatility was prevented from being lowered by adjusting the PVC (pigment volumn content).
[도막의 가교밀도 조절][Adjusting the crosslinking density of the coating film]
종래 PVC용 도료에서 일반적으로 사용되는 산경화제는 파라톨루엔 술폰산형, 디노닐나프탈렌 술폰산형, 디노닐 나프탈렌 디술폰산형 등으로 블록킹(blocking)된 형태의 제품이 일반적으로 사용되어 지고 있으며, 섭씨 약 140∼150℃에서 블록킹된 물질이 해리되면서 주수지(폴리에스테르 수지)와 가교제(멜라민 수지)의 가교반응이 시작된다.Conventional acid curing agents commonly used in paints for PVC include products such as para-toluenesulfonic acid type, dinonylnaphthalenesulfonic acid type and dinonylnaphthalene disulfonic acid type which are generally used as blocking agents, When the blocked material is dissociated at ~ 150 ° C, the cross-linking reaction between the main resin (polyester resin) and the cross-linking agent (melamine resin) starts.
그러나 필요 이상의 가교반응을 억제시키기 위하여, 블록킹된 물질의 해리온도가 섭씨 180도씨 이상의 제품을 사용함으로서, 멜라민 수지의 셀프크로스링킹의 억제와 가교밀도의 적정 수준이 유지되도록 하여 도막 경화후, 도막의 연신율이 향상되도록 하였다.However, in order to suppress the crosslinking reaction more than necessary, the use of a product having a dissociation temperature of 180 deg. C or more for the blocked substance ensures that the self crosslinking of the melamine resin is suppressed and an appropriate level of crosslinking density is maintained, Lt; / RTI >
[하도의 적용][Application of Shadow]
상기와 같이 제조된 상도의 유연성을 유지시키기 위하여는 폴리에스테르/우레탄 수지를 기재로 한 하도를 사용하는데, 하도 자체의 기본물성인 일반적인 내식성, 상도와 도금강판과의 부착성 강화등 외에 충분한 연실율을 부여하여 소재와 상도 사이의 계면에서 충분한 완충작용을 하도록 함으로서, 가공시 발생되는 소재의 균열이 상도층까지 발전되지 않고 하도층에서 흡수되도록 하였다.In order to maintain the flexibility of the top coat prepared as described above, a base coat made of a polyester / urethane resin is used. In addition to the basic properties such as general corrosion resistance, top coat and adhesion to the coated steel sheet, So that sufficient cracking at the interface between the material and the upper surface is achieved so that the cracks of the material generated during processing are absorbed in the underlayer without being developed to the upper layer.
이때, 수지 조성은 강판의 사용용도에 따라 폴리에스테르와 우레탄수지 배합비를 적절히 조절한다.At this time, the resin composition appropriately controls the blending ratio of the polyester and the urethane resin according to the intended use of the steel sheet.
안료는 상·하도에 관계없이 일반적 PCM 용 도료에 사용되는 유기, 무기안료를 제한없이 사용한다.Regardless of whether it is top or bottom, pigments use organic and inorganic pigments for general PCM coatings without limitation.
상술한 본 발명상의 상도도료의 조성은 아래의 표 1과 같다.The composition of the top coat of the present invention as described above is shown in Table 1 below.
상기한 특성의 도료는 본 발명에서 목적으로 하는 가공성에 적합하도록 되어 있는바, 이를 용융아연도금강판에 적용시킨후 강판표면을 엠보스롤로서 압하처리하여 무늬를 형성시켜 기존 제품의 단조로움에서 탈피한 새로운 감각의 기능성, 감성의 특성을 갖는 도장강판이 이루어질 수 있는 것이다.The paints of the above-mentioned characteristics are adapted to the intended workability in the present invention. After applying this to the hot-dip galvanized steel sheet, the surface of the steel sheet is processed as an emboss roll to form a pattern, A coated steel sheet having a new sense of functionality and sensitivity can be made.
이하, 본 발명에 따른 칼라강판의 가공성을 시험한 결과와 외장성에 대하여 살펴본다.Hereinafter, the results of the test of the workability of the color steel sheet according to the present invention and the external appearance will be described.
1. 가공성 시험(T-굽힘시험)1. Workability test (T-bend test)
시험방법 : T-굽힘후 50배 확대 관찰Test method: 50 times magnification observation after T-bending
평가방법 : 가공후 크랙의 정도Evaluation method: Degree of crack after machining
* 여기서 T는 굽힘시험상 사용되는 굽힘정도를 나타내는 부호이다.* Where T is a sign indicating the degree of bending used in the bend test.
종래의 레귤러 폴리에스테르 도포강판Conventional regular polyester coated steel sheet
본 발명에 따른 플렉서블 폴리에스테르 도포강판The flexible polyester-coated steel sheet according to the present invention
표면사진 비교에서 알수 있듯이, 본 발명에 따른 용융아연도금 칼라강판의 가공성이 종래 강판보다 월등히 뛰어남을 알수 있다.As can be seen from the comparison of the surface photographs, it can be seen that the hot-dip galvanized steel sheet according to the present invention is superior in workability to the conventional steel sheet.
즉 가공시 외부의 물리적인 압력에 대하여 1차로 연신율이 우수한 상도 도료의 수지층이 강판 표면에서 가공성을 부여하고, 2차로 내식성 및 부착성을 위하여 도포하는 하도가 소재와 상도사이의 계면에서 완충작용을 하여 가공시 발생되는 소재의 균열이 상도층까지 발전되지 않고 하도층에서 흡수되기 때문에 가공성이 향상될 수 있는 것이다.That is, the resin layer of the top coat paint having excellent elongation at the first elongation against the external physical pressure at the time of processing imparts processability to the surface of the steel sheet and the undercoat applied secondarily for corrosion resistance and adhesion has a buffering effect at the interface between the material and the top coat The cracks of the material generated during processing are absorbed in the underlayer without being developed to the upper layer, so that the workability can be improved.
그에 따라서 성형 가공시 강판표면에 대한 손상을 줄일수 있다.Accordingly, it is possible to reduce the damage to the surface of the steel sheet during the molding process.
2. 외장성(표면무늬)2. Exterior (surface pattern)
마이크로 사진 촬영한 표면사진(아래 강판표면의 확대사진 참조)Micro-photographed surface photograph (see enlarged image of steel surface below)
본 발명에 따른 용융아연도금 칼라강판은 엠보스 처리된 표면에 아름다운 무늬가 형성되어 있어 입체감을 가지므로 외장성이 뛰어남을 알 수 있다.The hot-dip galvanized steel sheet according to the present invention has a beautiful pattern formed on the embossed surface, so that it has a three-dimensional effect, so that it is excellent in external appearance.
즉, 무늬가 새겨진 엠보스롤을 본 발명에 의해 준비된 칼라강판에 압하처리하여 표면에 무늬를 형성시켜 기존의 평활한 칼라강판보다 미려한 모양을 나타낸다.That is, emboss rolls with engraved patterns are subjected to a pressing process on the color steel plates prepared according to the present invention to form patterns on the surface, which is more beautiful than the conventional smooth color steel plates.
상술한 시험들에 의한 비교결과에 의하면, 본 발명에 따른 용융아연도금 칼라강판은 종래의 일반변성 칼라강판보다 가공성 및 표면의 외장성 등의 면에서 모두 우수한 성질의 것으로 나타냄을 확인할 수 있었다.According to the results of the above-described tests, it was confirmed that the hot-dip galvanized steel sheet according to the present invention exhibits excellent properties both in terms of workability and surface hardness, compared with the conventional denatured steel sheet.
또한 뛰어난 가공성으로 성형가공시 강판표면에 대한 손상을 줄일 수 있었다.In addition, it was possible to reduce the damage to the surface of the steel sheet during the molding process due to excellent workability.
그외 본 발명에 따라 플렉서블 폴리에스테르 도료를 피복한 칼라강판은 도료의 특성상 우수한 도장작업성, 향상된 내식성 및 내마모성도 갖는다.In addition, the colored steel sheet coated with the flexible polyester paint according to the present invention has excellent painting workability, improved corrosion resistance and abrasion resistance due to the characteristics of the paint.
Claims (4)
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| KR1019960019652A KR0180864B1 (en) | 1996-06-03 | 1996-06-03 | Hot-dip zn coated color steel sheet and its manufacturing method |
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| KR1019960019652A KR0180864B1 (en) | 1996-06-03 | 1996-06-03 | Hot-dip zn coated color steel sheet and its manufacturing method |
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| KR100395098B1 (en) * | 1996-12-05 | 2003-11-20 | 주식회사 포스코 | Manufacturing method of strip for soundproofing wall outer panel using steel color painted strip |
| KR100503164B1 (en) * | 2002-09-19 | 2005-07-21 | 유니온스틸 주식회사 | Super weather color steel plate and its manufacturing method |
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