KR20000043691A - Process for producing coated steel sheet for covered corrugated steel pipe - Google Patents
Process for producing coated steel sheet for covered corrugated steel pipe Download PDFInfo
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- KR20000043691A KR20000043691A KR1019980060096A KR19980060096A KR20000043691A KR 20000043691 A KR20000043691 A KR 20000043691A KR 1019980060096 A KR1019980060096 A KR 1019980060096A KR 19980060096 A KR19980060096 A KR 19980060096A KR 20000043691 A KR20000043691 A KR 20000043691A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
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Abstract
Description
본 발명은 피복파형강관용 피복강판에 관한 것으로서, 보다 상세하게는 폴리에틸렌 피복층과 개질의 접착성 폴리에틸렌 접착층으로 구성되는 2층 구조의 필름을 용융아연도금강판에 피복하는 피복파형강관용 피복강판 제조방법에 관한 것이다.The present invention relates to a coated steel sheet for coated corrugated steel pipe, and more particularly, to a coated steel sheet for coated corrugated steel pipe coated with a hot dip galvanized steel film having a two-layer structure composed of a polyethylene coated layer and a modified adhesive polyethylene adhesive layer. It is about.
파형강관은 KS D 3590 규격에 따른 제품으로 600g/m2인 용융아연도금강판을 원료로 하여 생산된다. 이하에서 지칭되는 파형강관은 모두 상기 규격에 따르고, 나선형 및 파형으로 가공된 제품을 의미한다.Corrugated steel pipe is a product according to KS D 3590 standard, and is produced by using hot-dip galvanized steel sheet of 600g / m 2 . Corrugated steel pipe referred to below means all products conforming to the above standards and processed into spirals and corrugations.
현재, 사용되는 파형강관은 주로 우수용 배수관으로 사용되며, 부식과 마모가 심한 하수도용 오, 폐수관에는 콘크리트 흄관이 이용되고 있다. 파형강관의 경우, 용융아연도금강판 표면의 아연 도금층이 내식성을 발휘하고, 현장작업이 용이하므로 그 수요가 점차 확대되고 있다.At present, the corrugated steel pipes used are mainly used as drainage pipes for rainwater, and concrete fume pipes are used for sewage and wastewater pipes with high corrosion and wear. In the case of corrugated steel pipes, the galvanized layer on the surface of the hot-dip galvanized steel sheet exhibits corrosion resistance and is easy to work on site, so the demand is gradually expanding.
이러한 파형강관의 내구성을 증가시키기 위하여 여러 가지 피복파형강관이 개발, 사용되고 있다. 피복파형강관은 그 피복 형태에 따라 여러 가지가 있는데, 기존에 사용되고 있는 피복파형강관 제조방법에는 파형강관을 제조한 후 피복하는 방법과 용융아연도금강판을 피복한 후 파형강관을 제조하는 방법, 즉 선(先) 피복법이 있다.In order to increase the durability of such corrugated steel pipes, various coated corrugated steel pipes have been developed and used. There are various types of coated corrugated steel pipes according to the type of coating. The conventionally used coated corrugated steel pipe manufacturing methods include a method of manufacturing corrugated steel pipes and coating them, and a method of manufacturing corrugated steel pipes after coating hot-dip galvanized steel sheets. There is a pre-coating method.
파형강관 제조 후 피복하는 방법에는 아스팔트 코팅, 에폭시 코팅, PVC 프라스티졸 코팅 등이 있으나, 피복파형강관의 내구성은 선 피복법에 의한 에틸렌 아클릴산 공중합 수지 피복법이 가장 우수한 것으로 알려져 있다(NCSPA 보고서 "Evaluation Methodology for Corrugated Steel Pipe Coating/Invert Treatments", March, 1996).The coating method of corrugated steel pipe after coating is asphalt coating, epoxy coating, PVC plastisol coating, etc., but the durability of coated corrugated steel pipe is known to be best coated with ethylene acrylic acid copolymer resin by line coating method (NCSPA report). "Evaluation Methodology for Corrugated Steel Pipe Coating / Invert Treatments", March, 1996).
한편, ASTM A/742/A 742M(Steel sheet, metallic coated and polymer precoated for corrugated steel pipe)에서 규정하고 있는 선 피복형 파형강관은 피복용 필름 재료로 에틸렌 아크릴산 공중합 수지를 규정하고 있다. 에틸렌 아크릴산 공중합 수지는 접착성이 불량한 폴리에틸렌 수지를 아크릴산과 공중합하여 금속과의 접착력을 부여한 수지이다.Meanwhile, the wire-coated corrugated steel pipe specified in ASTM A / 742 / A 742M (Steel sheet, metallic coated and polymer precoated for corrugated steel pipe) defines ethylene acrylic acid copolymer resin as a coating film material. Ethylene acrylic acid copolymer resin is resin which copolymerized polyethylene resin with poor adhesiveness with acrylic acid, and provided the adhesive force with metal.
기존의 선 피복형 파형강관은 이러한 공중합 수지를 필름으로 가공하고, 가공한 필름을 용융아연도금강판에 라미네이션하여 피복 용융아연도금강판을 성형하고, 이를 조관하여 만들어졌다. ASTM A/742/A 742M에서 규정하고 있는 선 피복형 파형강관은 내면과 외면의 피복 두께를 250/75㎛로 규정하고 있으며, 다른 두께의 피복 또한 가능하다고 되어 있다. 통상의 피복 두께는 250/250㎛가 사용되고 있다.Conventional line-coated corrugated steel pipe was made by processing such a copolymer resin into a film, laminating the processed film on a hot-dip galvanized steel sheet to form a coated hot-dip galvanized steel sheet, and fabricating it. The wire-coated corrugated steel pipe specified in ASTM A / 742 / A 742M specifies the coating thickness of the inner and outer surfaces to be 250 / 75㎛, and it is possible to coat other thicknesses. 250/250 micrometers is used for the normal coating thickness.
필름은 그 물리적 화학적 구조에 따라 각각 다른 투과 특성을 가지게 되는데, 에틸렌 아크릴산 공중합 수지 필름은 그 화학 구조 중에 아크릴산을 함유하고 있기 때문에 수분의 투과나 이와 유사한 화학 구조를 가지는 부식성 물질의 투과에 취약하다. 이를 개선하기 위하여 아크릴산의 함량을 조절하게 되면, 금속과의 접착력이 취약해진다. 또한 수분 등의 투과도를 감안하여 피복 두께를 두껍게 할 경우, 상대적으로 고가인 수지에 의하여 전체 피복파형강관의 가격을 상승시키며, 두꺼운 피복층과 금속의 열팽창계수 차이로 인하여 피복 필름의 계면박리를 발생시킬 수 있다. 또한 피복층 수지가 단일 수지로 조성되어 있기 때문에 용융아연도금강판에 필름을 라미네이션할 경우, 접착성 확보를 위한 용융아연도금강판의 가열온도와 피복 필름의 열 손상 온도사이의 온도 조절이 용이하지 않거나, 접착성 확보에 필요한 가열이 이루어지지 않는다.Each film has different permeation properties according to its physical and chemical structure. Since the ethylene acrylic acid copolymer resin film contains acrylic acid in its chemical structure, the film is vulnerable to permeation of corrosive materials having water or similar chemical structures. When the content of acrylic acid is adjusted to improve this, the adhesion with the metal becomes weak. In addition, when the thickness of the coating is increased in consideration of the permeability such as moisture, the price of the entire coated corrugated steel pipe is increased by a relatively expensive resin, and the interfacial peeling of the coating film may occur due to the difference in the coefficient of thermal expansion between the thick coating layer and the metal. Can be. In addition, since the coating layer resin is composed of a single resin, when laminating the film on the hot-dip galvanized steel sheet, it is not easy to control the temperature between the heating temperature of the hot-dip galvanized steel sheet and the heat damage temperature of the coated film to ensure adhesion. There is no heating required to ensure adhesion.
따라서 본 발명은 피복파형강관의 내구성을 증대시키기 위하여 수분 투과를 억제하고, 용융아연도금강판과의 접착성을 확보하는 2층 구조의 필름을 용융아연도금강판에 라미네이션하는 피복파형강관용 피복강판 제조방법을 제공하는 데 그 목적이 있다.Therefore, the present invention is to manufacture a coated steel sheet for coated corrugated steel pipe to suppress the moisture permeation and to laminate the film of the two-layer structure to secure the adhesion with the hot-dip galvanized steel sheet in order to increase the durability of the coated corrugated steel pipe. The purpose is to provide a method.
이를 실현하기 위한 본 발명의 피복파형강관용 피복강판 제조방법은 폴리에틸렌 피복층과 개질의 접착성 폴리에틸렌 접착층으로 필름을 제조하고, 용융아연도금강판을 가열하여, 필름을 압착하는 라미네이션 공정에 의하여 피복 성형함을 특징으로 한다.In order to achieve this, the coated corrugated steel sheet manufacturing method of the present invention manufactures a film using a polyethylene coating layer and a modified adhesive polyethylene adhesive layer, heats the hot-dip galvanized steel sheet, and coats the film by a lamination process of pressing the film. It is characterized by.
이하 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명에서는 피복 필름을 폴리에틸렌 피복층과 에틸렌을 개질한 폴리에틸렌 접착층의 2층 구조로 구성하고, 피복층의 두께를 피복 필름 총 두께의 90%정도로 하여 피복 필름의 인장강도를 필름의 접착력보다 크지 않도록 설계하므로 필름의 접착 특성을 손상시키지 않고, 두꺼운 피복을 가능하게 한다. 복층 필름은 T-다이에서 공압출로 성형 가능하다. 피복층은 폴리에틸렌 수지를, 접착층은 폴리에틸렌 변성 수지를 사용하므로 필름의 2층간 상용성을 확보하여 접착성 저하를 방지한다.In the present invention, the coating film is composed of a two-layer structure of a polyethylene coating layer and a polyethylene adhesive layer modified with ethylene, and the thickness of the coating layer is set to about 90% of the total thickness of the coating film, so that the tensile strength of the coating film is not larger than the adhesive force of the film. A thick coating is possible without compromising the adhesive properties of the film. The multilayer film can be molded by coextrusion in a T-die. Since the coating layer uses a polyethylene resin and the adhesive layer uses a polyethylene modified resin, the compatibility between the two layers of the film is ensured to prevent a decrease in adhesion.
피복층의 수지는 저, 고밀도 폴리에틸렌 등 에틸렌만으로 만든 폴리올레핀이, 선형저밀도 폴리에틸렌 등 에틸렌-α올레핀 공중합체가 사용될 수 있다.The resin of the coating layer may be a polyolefin made only of ethylene such as low and high density polyethylene, and an ethylene-α olefin copolymer such as linear low density polyethylene may be used.
접착층의 수지는 피복층 수지인 폴리에틸렌과 상용성을 가지면서 용융아연도금강판에 접착성을 가지는 수지가 이용될 수 있으며, 이 접착층의 수지는 피복층 수지와의 접착력 및 용융아연도금강판과의 접착력을 동시에 가지는 것이 매우 중요하다. 접착층 수지는 에틸렌비닐아세테이트 공중합체 혹은 에틸렌비닐아세테이트 공중합체와 폴리에틸렌의 블렌드에 의하여 제조되거나, 폴리에틸렌 분자에 말레산, 아크릴산, 푸마르산, 이타콘산 등의 불포화 유기산과 그의 무수물 또는 유도체를 단독 또는 같이 사용하여 제조되거나, 글리시딜 메타크릴레이트, 히드록시에틸 메타크릴레이트 등을 그래프트하여 변성한 폴리에틸렌계 접착성 수지를 사용할 수 있다.The resin of the adhesive layer may be a resin having adhesion to the hot-dip galvanized steel sheet having compatibility with polyethylene, which is a coating layer resin, and the resin of the adhesive layer simultaneously has the adhesive strength with the coating-layer resin and the adhesion with the hot-dip galvanized steel sheet. It is very important to have. The adhesive layer resin is prepared by blending an ethylene vinyl acetate copolymer or an ethylene vinyl acetate copolymer with polyethylene, or using an unsaturated organic acid such as maleic acid, acrylic acid, fumaric acid or itaconic acid and anhydrides or derivatives thereof alone or in combination with polyethylene molecules. Polyethylene adhesive resin prepared or modified by grafting glycidyl methacrylate, hydroxyethyl methacrylate, or the like can be used.
이와 같이 제조된 폴리에틸렌계 피복 필름을 사용하여 가열된 용융아연도금강판에 라미네이션 방법에 의하여 필름의 접착층 수지를 용융 접착시켜 피복을 형성한다. 이 때 용융아연도금강판은 두께가 1.6, 2.7, 3.2mm인 것이 사용될 수 있으며, 파형강관의 규격에 맞추어 용융아연도금을 사용하는 것이 피복파형강관의 내구성 측면에서 보다 바람직하다. 또한 피복 필름의 두께는 피복의 접착 특성을 손상시키지 않는 범위 내에서 가능한 두꺼운 것이 피복파형강관의 내구성에 유리하다. 따라서 피복 필름의 총 두께 1mm 중 피복층과 접착층의 두께 비를 9 : 1로 한다.The adhesive layer resin of the film is melt-bonded by a lamination method to the hot-dip galvanized steel sheet heated using the polyethylene-based coating film thus prepared to form a coating. At this time, the hot-dip galvanized steel sheet may be used with a thickness of 1.6, 2.7, 3.2mm, it is more preferable to use hot-dip galvanized in accordance with the specification of corrugated steel pipe in terms of durability of the coated corrugated steel pipe. In addition, the thickness of the coating film is as thick as possible within the range that does not impair the adhesive properties of the coating is advantageous to the durability of the coated waveform steel pipe. Therefore, the thickness ratio of the coating layer and the adhesive layer in the total thickness of the coating film 1mm is 9: 1.
이하 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예 1Example 1
실시예 1은, 피복층으로 저밀도 폴리에틸렌을, 접착층으로는 폴리에틸렌과 에틸렌비닐아세테이트 공중합체를 원료로 개질하여 75, 125℃의 두 용용온도를 가지는 접착성 폴리에틸렌을 사용하여, 총 두께가 1mm이고 피복층과 접착층의 두께 비가 9 : 1인 2충 구조의 필름을 공압출로 제조하고, 이 필름을 피복파형강관용 라미네이션 필름으로 사용한다.Example 1 is a low-density polyethylene as a coating layer, and a polyethylene and an ethylene vinyl acetate copolymer as a raw material, and modified polyethylene having two melting temperatures of 75 and 125 ° C. as a raw material. A two-pack film having a thickness ratio of the adhesive layer of 9: 1 is produced by coextrusion, and the film is used as a lamination film for coated corrugated steel pipe.
라미네이션 가공에 사용되는 용융아연도금강판의 두께는 1.6, 2.7, 3.2mm이다. 라미네이션 공정에서 피복의 접착은 용융아연도금강판을 가열하고, 가열된 용융아연도금강판에 필름 접착층을 압착롤로 압착하므로 용융아연도금강판의 열에 의하여 필름 접착층이 용융된 후 냉각되면서 이루어진다. 라미네이션 공정에서, 압착롤에서의 용융아연도금강판의 온도는 140∼170℃로, 용융아연도금강판의 진행 속도는 분당 20m로 각각 설정한다.The hot dip galvanized steel sheet used for lamination is 1.6, 2.7, 3.2mm thick. In the lamination process, the adhesion of the coating is performed by heating the hot-dip galvanized steel sheet and pressing the film adhesive layer on the heated hot-dip galvanized steel sheet with a squeeze roll to cool the melted film adhesive layer by the heat of the hot-dip galvanized steel sheet. In the lamination process, the temperature of the hot-dip galvanized steel sheet in the crimping roll is set to 140 to 170 ° C, and the traveling speed of the hot-dip galvanized steel sheet is set to 20 m per minute, respectively.
실시예 2Example 2
실시예 2는, 실시예 1이 피복층으로 저밀도 폴리에틸렌을 사용한 것과 달리, 선형저밀도 폴리에틸렌을 사용한다. 이를 제외하고는 실시예 1과 동일한 조건으로 필름을 제조하고, 그 필름으로 용융아연도금강판을 피복한 시험편을 형성한다.Example 2 uses linear low density polyethylene, whereas Example 1 uses low density polyethylene as the coating layer. Except this, a film was prepared under the same conditions as in Example 1, and a test piece coated with a hot-dip galvanized steel sheet was formed from the film.
실시예 3Example 3
실시예 3은, 실시예 1이 피복층으로 저밀도 폴리에틸렌을, 접착층으로는 폴리에틸렌과 에틸렌비닐아세테이트 공중합체를 원료로 개질하여 75, 125℃의 두 용용온도를 가지는 접착성 폴리에틸렌을 사용하여 총 두께가 1mm인 필름을 제조하는 것과는 달리, 피복층으로 중밀도 폴리에틸렌(밀도0.984)을 사용하고, 접착층으로 폴리에틸렌을 개질한 접착성 폴리에틸렌을, 피복 필름의 인장강도가 라미네이션 후 접착층의 접착력을 넘지 않도록 총 두께가 0.8mm인 필름을 제조한다. 이를 제외하고는, 실시예 1과 동일한 조건으로 필름을 제조하고, 그 필름으로 용융아연도금강판을 피복한 시험편을 형성한다.In Example 3, Example 1 is a low-density polyethylene as a coating layer, and polyethylene and ethylene vinyl acetate copolymers are modified as raw materials, and adhesive polyethylene having two melting temperatures of 75 and 125 ° C. is used as the total thickness of 1 mm. Unlike manufacturing the phosphor film, the adhesive layer using medium density polyethylene (density 0.984) as the coating layer and the polyethylene modified as the adhesive layer, and the total thickness is 0.8 so that the tensile strength of the coating film does not exceed the adhesive strength of the adhesive layer after lamination. A film of mm is produced. Except for this, a film was prepared under the same conditions as in Example 1, and a test piece coated with a hot dip galvanized steel sheet was formed from the film.
실시예 4Example 4
실시예 4는, 실시예 1이 피복층으로 저밀도 폴리에틸렌을, 접착층으로는 폴리에틸렌과 에틸렌비닐아세테이트 공중합체를 원료로 개질하여 75, 125℃의 두 용용온도를 가지는 접착성 폴리에틸렌을 사용하여 총 두께가 1mm인 필름을 제조하는 것과는 달리, 피복층으로 중밀도 폴리에틸렌(밀도0.984)을, 접착층으로 폴리에틸렌을 개질하여 120℃의 용융 온도를 가지는 접착성 폴리에틸렌을 사용하여, 피복 필름의 인장강도가 라미네이션 후 접착층의 접착력을 넘지 않도록 총 두께가 0.8mm인 필름을 제조한다. 이를 제외하고는, 실시예 1과 동일한 조건으로 필름을 제조하고, 그 필름으로 용융아연도금강판을 피복한 시험편을 형성한다.In Example 4, Example 1 is a low-density polyethylene as a coating layer, and a polyethylene and an ethylene vinyl acetate copolymer are modified as a raw material, and adhesive polyethylene having two melting temperatures of 75 and 125 ° C. is used, and the total thickness is 1 mm. Unlike manufacturing the phosphor film, using a medium density polyethylene (density 0.984) as the coating layer, and an adhesive polyethylene having a melting temperature of 120 ℃ by modifying the polyethylene as the adhesive layer, the tensile strength of the coating film after lamination, the adhesive strength of the adhesive layer A film having a total thickness of 0.8 mm is prepared so as not to exceed. Except for this, a film was prepared under the same conditions as in Example 1, and a test piece coated with a hot dip galvanized steel sheet was formed from the film.
비교예 1Comparative Example 1
비교예 1은, 실시예 1이 접착층으로 폴리에틸렌과 에틸렌비닐아세테이트 공중합체를 원료로 개질하여 75, 125℃의 두 용용온도를 가지는 접착성 폴리에틸렌을 사용하여 필름을 제조하는 것과는 달리, 접착층으로 폴리에틸렌을 개질하여 120℃의 용융 온도를 가지는 수지를 사용하여 필름을 제조한다. 이를 제외하고는, 실시예 1과 동일한 조건으로 필름을 제조하고, 그 필름으로 용융아연도금강판을 피복한 시험편을 형성한다.In Comparative Example 1, unlike Example 1, a polyethylene was used as an adhesive layer to prepare a film using an adhesive polyethylene having two melting temperatures of 75 and 125 ° C. by modifying polyethylene and ethylene vinyl acetate copolymer as raw materials. The film is modified using a resin having a melting temperature of 120 ° C. Except for this, a film was prepared under the same conditions as in Example 1, and a test piece coated with a hot dip galvanized steel sheet was formed from the film.
비교예 2Comparative Example 2
비교예 2는, 실시예 1이 피복층으로 저밀도 폴리에틸렌을, 접착층으로는 폴리에틸렌과 에틸렌비닐아세테이트 공중합체를 원료로 개질한 접착성 폴리에틸렌을 사용하여 필름을 제조하는 것과 달리, 피복층으로 중밀도 폴리에틸렌을, 접착층으로는 폴리에틸렌을 개질한 점착성 폴리에틸렌을 사용하여 필름을 제조한다. 이를 제외하고는, 실시예 1과 동일한 조건으로 필름을 제조하고, 그 필름으로 용융아연도금강판을 피복한 시험편을 형성한다.In Comparative Example 2, unlike Example 1, a low-density polyethylene was used as the coating layer, and a medium-density polyethylene was used as the coating layer, unlike the production of the film using the adhesive polyethylene obtained by modifying polyethylene and ethylene vinyl acetate copolymer as a raw material. As an adhesive layer, the film is manufactured using the adhesive polyethylene which modified polyethylene. Except for this, a film was prepared under the same conditions as in Example 1, and a test piece coated with a hot dip galvanized steel sheet was formed from the film.
따라서 실시예 1, 2, 3, 4와 같이 성형된 시험편, 즉 피복 용융아연도금강판은, 90°박리시험에 의한 접착력 시험에서 용융아연도금강판의 접착력은 피복 필름의 인장강도보다 크기 때문에 필름의 연신이 발생하여 피복이 접착계면에서 박리되지 않았다. 또한 라미네이션 공정에 의하여 성형된 피복 용융아연도금강판을 롤 가공에 의하여 파형을 가공하고, 피복 접착력을 시험하였다. 평판의 경우와 마찬가지로 롤 가공에 의한 파형 가공에 의하여 접착력의 저하가 발생하지 않았다. 영하 30∼60℃, 150회 열 사이클에 의한 접착강도 저하시험에서도 초기의 접착력을 유지하였다.Therefore, in the test pieces molded as in Examples 1, 2, 3, and 4, that is, the coated hot dip galvanized steel sheet, the adhesion of the hot dip galvanized steel sheet in the adhesion test by the 90 ° peel test was greater than the tensile strength of the coated film. Stretching occurred and the coating did not peel off at the adhesive interface. Further, the coated hot-dip galvanized steel sheet formed by the lamination process was subjected to a corrugation by roll processing, and the coated adhesive force was tested. As in the case of a flat plate, the fall of adhesive force did not generate | occur | produce by the corrugation process by roll processing. The initial adhesive strength was maintained even in the test of lowering the adhesive strength by subtracting 30 to 60 ° C. and 150 thermal cycles.
그러나 비교예 1과 같이 성형된 시험편, 피복 용융아연도금강판은, 실시예 1과 달리 접착층의 접착력 확보를 위하여 충분한 압착 시간을 필요로 하였다. 이 과정에서 필름의 외부 피복층은 용융에 의하여 외관이 손상되었다. 외관이 손상되지 않도록 170℃에서 라미네이션 성형된 피복 용융아연도금강판은 90°박리시험에서 박리되었다. 또한 롤 가공에 의한 파형 가공에 의하여 접착력 저하가 크게 발생하였다.However, the test piece and the coated hot-dip galvanized steel sheet molded as in Comparative Example 1 required a sufficient compression time to secure the adhesive strength of the adhesive layer, unlike Example 1. In this process, the outer coating layer of the film was damaged in appearance by melting. The coated hot-dip galvanized steel sheet laminated at 170 ° C. was peeled in a 90 ° peel test so as not to damage the appearance. Moreover, the fall of adhesive force was largely generated by the corrugation process by roll processing.
비교예 2와 같이 성형된 시험편, 즉 피복 용융아연도금강판은 비교예 1과 달리 190℃의 용융아연도금강판 표면 온도에서도 강판의 온도에 의한 필름의 피복층 외관이 손상되지 않았다. 그러나 90°박리시험에 의한 접착력 시험에서 용융아연도금강판의 접착력이 피복 필름의 인장강도보다 작아서 피복 필름이 접착계면에서 박리되었다. 또한 롤 가공에 의한 파형 가공에 의하여 접착력 저하도 크게 발생하였다.The test piece molded as in Comparative Example 2, that is, coated hot dip galvanized steel sheet, unlike Comparative Example 1, the coating layer appearance of the film due to the temperature of the steel sheet was not damaged even at the surface temperature of the hot dip galvanized steel sheet of 190 ℃. However, in the adhesion test by the 90 ° peel test, the adhesion of the hot-dip galvanized steel sheet was smaller than the tensile strength of the coating film, and the coating film was peeled off at the adhesion interface. Moreover, the fall of adhesive force also generate | occur | produced largely by the corrugation process by roll processing.
본 발명에 따른 피복파형강관용 피복강판 제조방법은 필름의 피복층을 수분과 친화력이 있는 작용기를 가지지 않는 폴리에틸렌 재질을 사용하고, 그 피복층의 두께를 피복의 접착 내구성에 영향을 미치지 않는 범위 내에서 두껍게(폴리에틸렌 피복층 : 폴리에틸렌 접착층 = 9 : 1) 하므로 수분의 투과를 억제하여 피복파형강관의 내구성을 증대시킬 수 있다. 또 본 발명은 필름의 접착층을 피복층의 용융 온도보다 낮음과 동시에 피복층 수지인 폴리에틸렌과 상용성을 가지면서 용융아연도금강판에 접착성을 가지는 에틸렌비닐아세테이트 공중합체와 폴리에틸렌의 블렌드로 제조하므로 라미네이션 공정 중에 쉽게 용융 접착되어 용융아연도금강판과의 접착성을 확보할 수 있다.In the method for manufacturing coated steel sheet for coated corrugated steel pipe according to the present invention, the coating layer of the film is made of polyethylene material having no functional group with affinity for water, and the thickness of the coating layer is thick within the range that does not affect the adhesion durability of the coating. (Polyethylene Covering Layer: Polyethylene Adhesive Layer = 9: 1) Therefore, moisture permeation can be suppressed to increase the durability of the coated corrugated steel pipe. In addition, the present invention manufactures the adhesive layer of the film is lower than the melting temperature of the coating layer and at the same time compatible with the polyethylene resin of the coating layer and made of a blend of ethylene vinyl acetate copolymer and polyethylene having adhesion to the hot-dip galvanized steel sheet during the lamination process Easily melt bonded to ensure adhesion with the hot-dip galvanized steel sheet.
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| JPH062161A (en) * | 1992-06-15 | 1994-01-11 | Nkk Corp | Galvanized steel sheet excellent in formability, external appearance characteristic after forming, and corrosion resistance |
| KR950004206U (en) * | 1993-07-13 | 1995-02-17 | Corrugated Steel Pipe with Anti-oxidation Plate | |
| KR950006271B1 (en) * | 1993-09-17 | 1995-06-13 | 포항종합제철주식회사 | Making method of hot rolling plating plate with corrosion resistant |
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