EP0054210A1 - Procédé pour revêtir des tubes métalliques - Google Patents

Procédé pour revêtir des tubes métalliques Download PDF

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Publication number
EP0054210A1
EP0054210A1 EP81109982A EP81109982A EP0054210A1 EP 0054210 A1 EP0054210 A1 EP 0054210A1 EP 81109982 A EP81109982 A EP 81109982A EP 81109982 A EP81109982 A EP 81109982A EP 0054210 A1 EP0054210 A1 EP 0054210A1
Authority
EP
European Patent Office
Prior art keywords
layer
powder
hardener
epoxy
epoxy resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81109982A
Other languages
German (de)
English (en)
Inventor
Horst Pieser
Bernhard Dr. Dors
Georg Kopka
Werner Lindner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Publication of EP0054210A1 publication Critical patent/EP0054210A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • 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
    • B05D7/148—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 using epoxy-polyolefin systems in mono- or multilayers
    • 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
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat

Definitions

  • the invention relates to a method for the outer coating of a metal tube with at least two organic composite layers and subsequent polyethylene sheathing by applying at least one layer which promotes adhesion and corrosion protection to the metallic substrate and further application of at least one layer which promotes polyethylene.
  • the coating of metal pipes with polyethylene is done in practice so that the pipe first receives a layer of, for example, an acrylic-ethylene copolymer, which serves as an adhesion promoter between the metal substrate on the one hand and the polyethylene coating on the other.
  • these materials are applied in various ways, e.g. by the powder-litter method, by tube extrusion or foil winding method. Combinations of these application methods can also be used.
  • the object of the invention was to provide an improved method with higher corrosion protection and improved long-term adhesion under corrosion stress while avoiding the above disadvantages.
  • This object is achieved by a process for the external coating of a metal pipe with at least two organic composite layers and subsequent polyethylene sheathing by applying at least one layer which promotes adhesion and corrosion protection to the metallic substrate, then applying at least one layer which promotes the subsequent polyethylene, which is characterized in that the is applied as a powder to the preheated metal pipe to the metallic substrate, where it melts thermally into a film and is crosslinked thermosetly.
  • the crosslinking layer is then applied with the layer which provides adhesion to the subsequent polyethylene and which consists of an acrylic / ethylene copolymer which is known per se consists.
  • a great advantage of the method according to the invention is that the powder which forms the layer which promotes adhesion to the metallic substrate can be applied with the known application devices for powder coatings, with a high efficiency which, by interposing powder recovery devices, achieves a material yield of approximately 99%.
  • the powder that forms the layer that promotes adhesion to the metallic substrate is thermosetting powder coatings based on polyacrylate, epoxy, polyurethane, epoxy polyester and polyester binders.
  • powder coatings based on epoxy binders are preferably proposed which act as a crosslinker which acts as a heat crosslinker. Contain cyan diamide hardener or its derivatives.
  • epoxy resin based on bisphenol A 20 to 2% by weight dicyandiamide hardener or its derivatives contains, whereby the sum of epoxy resin and hardener is always 100%.
  • pigments and / or fillers can be added to 100% of the epoxy resin hardener mixture.
  • 1 denotes the steel pipe.
  • 2 is the acrylic-ethylene copolymer layer and 3 the subsequent polyethylene coating.
  • the steel tube is also identified by 1 in FIGS. 3 and 4.
  • the thermosetting cross-linked powder layer thermally melted into a film is designated by 4.
  • the acrylic / ethylene copolymer layer 2 and the polyethylene sheathing 3 are then arranged thereon.
  • the entire structure is produced in such a way that a steel tube passes through a heating device in which it is heated to 250.degree.
  • the thermosetting powder is then applied using a suitable electrostatic application device.
  • An extruded film strip made of acrylic-ethylene copolymer is then wound onto the hardening layer and then an extruded film strip made of polyethylene is then wound up. The whole is pressed onto the pipe surface with an elastic pressure roller and the pipe thus coated is then cooled.
  • FIGS. 3 and 4 The structure shown in FIGS. 3 and 4 was compared in a stricter short-term test based on the ASTM test G8-72T (cathodic debonding test) at -1.9 volts with the structure shown in FIGS. 1 and 2. It was found here that the structure shown in FIGS. 1 and 2 had infiltrated to a length of 30 mm after two to three days, while the structure produced by the process according to the invention and shown in FIGS. body only showed an infiltration of less than 6 mm after 30 days.
  • FIGS. 5 and 6 show the structure of the test specimens for the comparative test.
  • FIG. 6 shows a steel plate 6 inserted in a polyethylene plate 5, which has a hardened powder coating layer 7, an acrylic-ethylene copolymer layer 8 and a polyethylene plate 9.
  • the assessment of the test plate is shown in FIG. 5, with the infiltration at the applied voltage of -1.9 volts starting from the bore, which in the example has a diameter of 6 mm and is designated by 10, and measured along the arrow 11 in millimeters becomes.
  • the curve denoted by 8 shows the comparison values obtained without the powder coating layer applied according to the invention and the curve denoted by 9 shows the values which were obtained with a casing produced by the method according to the invention and using a first powder coating layer.
  • the improvement obtained by the method according to the invention has an effect in practice due to the high level of insensitivity during transport and laying of the pipes as well as by significantly increasing their stability and reliability.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
EP81109982A 1980-12-09 1981-11-28 Procédé pour revêtir des tubes métalliques Withdrawn EP0054210A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3046263 1980-12-09
DE19803046263 DE3046263C2 (de) 1980-12-09 1980-12-09 Verfahren zum Ummanteln eines Metallrohres

Publications (1)

Publication Number Publication Date
EP0054210A1 true EP0054210A1 (fr) 1982-06-23

Family

ID=6118644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109982A Withdrawn EP0054210A1 (fr) 1980-12-09 1981-11-28 Procédé pour revêtir des tubes métalliques

Country Status (3)

Country Link
EP (1) EP0054210A1 (fr)
DE (1) DE3046263C2 (fr)
ES (1) ES507823A0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0183930A1 (fr) * 1984-12-06 1986-06-11 Hoesch Aktiengesellschaft Méthode de fabrication pour un tuyau métallique avec une couche protectrice contre la corrosion et les chocs
EP0698422A1 (fr) * 1994-06-22 1996-02-28 Bayer Ag Procédé pour l'isolation des tubes
EP0822012A1 (fr) * 1996-07-30 1998-02-04 Elf Atochem S.A. Revêtement de surfaces métalliques son application aux tubes et aux câbles
RU2203350C2 (ru) * 1999-10-20 2003-04-27 Открытое акционерное общество "НПО Энергомаш им. акад. В.П. Глушко" Способ защиты от коррозии разъемных соединений

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229563A1 (de) * 1982-08-07 1984-02-23 Hoechst Ag, 6230 Frankfurt Verfahren zur beschichtung von metallischen substraten und verwendung der nach diesem verfahren hergestellten erzeugnisse
GB2145639A (en) * 1983-08-25 1985-04-03 Shaw Ind Ltd Impact-resistant, moisture-impermeable resinous coatings and method of applying the same to an object
JP2709483B2 (ja) * 1988-09-17 1998-02-04 臼井国際産業株式会社 被覆金属管材における被覆形成方法
DE19843375C2 (de) 1998-09-10 2003-02-13 Sedra Asphalt Technik Biebrich Isolierende Ummantelung für Spurstangen
CN108692134B (zh) * 2018-07-06 2023-09-26 辽宁凌勃防腐工程科技有限公司 一种内外双防腐涂塑复合管及其一次成型工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2020901A1 (de) * 1969-09-15 1971-05-13 Continental Can Co Verfahren zum Herstellen von Metallgegenstaenden sowie Metallgegenstand mit einer mit Polyaethylen ueberzogenen Oberflaeche
FR2252187A1 (fr) * 1973-11-22 1975-06-20 Mitsui Petrochemical Ind

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2020901A1 (de) * 1969-09-15 1971-05-13 Continental Can Co Verfahren zum Herstellen von Metallgegenstaenden sowie Metallgegenstand mit einer mit Polyaethylen ueberzogenen Oberflaeche
FR2252187A1 (fr) * 1973-11-22 1975-06-20 Mitsui Petrochemical Ind

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0183930A1 (fr) * 1984-12-06 1986-06-11 Hoesch Aktiengesellschaft Méthode de fabrication pour un tuyau métallique avec une couche protectrice contre la corrosion et les chocs
EP0698422A1 (fr) * 1994-06-22 1996-02-28 Bayer Ag Procédé pour l'isolation des tubes
US5534299A (en) * 1994-06-22 1996-07-09 Bayer Aktiengsellschaft Process for insulating pipes
EP0822012A1 (fr) * 1996-07-30 1998-02-04 Elf Atochem S.A. Revêtement de surfaces métalliques son application aux tubes et aux câbles
US5993924A (en) * 1996-07-30 1999-11-30 Elf Atochem S. A. Coating of metal surfaces, its application to tubes and to cables
US6291024B1 (en) 1996-07-30 2001-09-18 Elf Atochem S.A. Coating of metal surfaces, its application to tubes and to cables
RU2203350C2 (ru) * 1999-10-20 2003-04-27 Открытое акционерное общество "НПО Энергомаш им. акад. В.П. Глушко" Способ защиты от коррозии разъемных соединений

Also Published As

Publication number Publication date
ES8305601A1 (es) 1983-04-16
DE3046263A1 (de) 1982-06-16
DE3046263C2 (de) 1982-12-09
ES507823A0 (es) 1983-04-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19820510

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19831125

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LINDNER, WERNER

Inventor name: PIESER, HORST

Inventor name: DORS, BERNHARD, DR.

Inventor name: KOPKA, GEORG