EP0026906B1 - Procédé de revêtement de tuyaux en métal et utilisation desdits tuyaux - Google Patents

Procédé de revêtement de tuyaux en métal et utilisation desdits tuyaux Download PDF

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Publication number
EP0026906B1
EP0026906B1 EP80105906A EP80105906A EP0026906B1 EP 0026906 B1 EP0026906 B1 EP 0026906B1 EP 80105906 A EP80105906 A EP 80105906A EP 80105906 A EP80105906 A EP 80105906A EP 0026906 B1 EP0026906 B1 EP 0026906B1
Authority
EP
European Patent Office
Prior art keywords
polyethylene
coating
melt index
stage
tube
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.)
Expired
Application number
EP80105906A
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German (de)
English (en)
Other versions
EP0026906A1 (fr
Inventor
Günter Eckner
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.)
Hoechst AG
Original Assignee
Hoechst 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25781375&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0026906(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19792940388 external-priority patent/DE2940388A1/de
Priority claimed from DE19792946459 external-priority patent/DE2946459A1/de
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to AT80105906T priority Critical patent/ATE4292T1/de
Publication of EP0026906A1 publication Critical patent/EP0026906A1/fr
Application granted granted Critical
Publication of EP0026906B1 publication Critical patent/EP0026906B1/fr
Expired 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
    • B05D7/14—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
    • B05D7/146—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 to metallic pipes or tubes
    • 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
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • B05D2507/00—Polyolefins
    • B05D2507/01—Polyethylene

Definitions

  • the coating of metal pipes with polyethylene powder is known, the z. B. is applied by Aufriesetn, spin coating or starting on the preheated tube to 300 to 360 ° C.
  • the types of polyethylene used in this process have melt indexes (190 ° C / 2.16 kg) of 1.2 to 1.7 g / 1 min.
  • the melt index must be higher than in the first-mentioned process because easier melting is essential for coating with powder in order to anchor the applied particles on the surface.
  • the coating time for powder is generally about 5 minutes.
  • this method has the disadvantage that, although high preheating temperatures are used, adequate corrosion protection due to the application of only one layer is often not achieved.
  • Another publication describes a composite pipe made of a polyethylene powder layer welded onto a steel pipe and a polyethylene layer welded to it, which, for. B. in the form of a polyethylene film emerging from an extruder onto the hot sintered polyethylene powder layer.
  • the steel tube is z. B. preheated to 150 ° C. At this temperature, however, it is not possible to produce a smooth, coherent layer in a desired required minimum layer thickness of 1.5 to 4 mm.
  • a polyethylene layer is applied to a steel pipe, firstly a 0.05 mm thick first layer of an adhesion promoter at a tube temperature about 100 ° C. above the solidification temperature of the adhesion promoter and then the second layer of the adhesion promoter at 20 to Pipe temperature 50 ° C above the solidification temperature, e.g. B. at 140 ° C, is applied.
  • the adhesion promoter of the first layer can be applied in powder form or by wrapping it with a film.
  • the second layer can be applied by pre-extrusion in the form of a double tube or a double wrapping film.
  • the temperature of 140 ° C. is not sufficient for the purposes desired according to the present invention, that is to say for the required minimum layer thickness.
  • Another document also discloses coating a steel tube surface with a polyethylene having a higher melt index, e.g. 1 to 1.5 g / 10 min (ASTM-D 1238-53T) and with a lower melt index polyethylene, e.g. B. 0.2 to 0.5 g / 10 min, the second layer being applied to the first coating.
  • a polyethylene having a higher melt index e.g. 1 to 1.5 g / 10 min (ASTM-D 1238-53T) and with a lower melt index polyethylene, e.g. B. 0.2 to 0.5 g / 10 min
  • Polyethylene powder is used to form both layers. If two layers are applied in the form of powder on top of one another, the surface sometimes leaves something to be desired in terms of their homogeneity and smoothness.
  • the subject of the invention is the method defined in claim 1.
  • a further possible embodiment of the invention provides according to claims 3 to 5 that first of all a polyethylene powder with a melt index of 1.2 to 1.7 g / 10 min or a strip of polyethylene emerging directly from an extruder with a melt index of at most 1 , 7 g / 10 min (190 ° C / 2.16 kg) on a metal tube, which in the case of powder coating has a temperature of at least 300 ° C and in the case of the coating from the extruder a maximum of 250 ° C, then the coating is allowed to cool to a temperature of about 110 to 170, preferably 110 to 150 ° C and then in a third stage a self-supporting, light-stabilized, light-colored polyethylene film with a melt index of 0.4 to 1.1 g / 10 min at this temperature.
  • compounds of the benzotriazole type are suitable as light stabilizers for the light-colored polyethylene film.
  • a layer thickness of 1.5 to 4 mm is generally required for adequate corrosion protection. In some cases, the layer thickness can also be more than 4 mm. However, the layer thickness must be at least 1.5 mm, because otherwise there is an excessive cathodic protective current requirement.
  • the process according to the invention has the advantage that, in general, compared to known processes, it surprisingly results in energy savings and nevertheless a considerably higher working speed with at least equally good production properties.
  • the combination of powder application coating with the tape film coating - in this order mentioned - has succeeded in reducing the energy consumption through targeted temperature control, but at the same time improving the quality of the coating because any pores that occur from the powder coating the film cover is closed by welding.
  • the light-colored cover layer provides good protection for the pipes against excessive heating when stored outdoors for long periods under the influence of heat, for example due to sunshine or by laying in strongly heated floor layers.
  • the coating of the extruder is also very simple and time-saving without additional equipment.
  • the strip emerging from the extruder advantageously has a melt index of at least 0.4 g / 10 min.
  • the polyethylene in the powder coating expediently has a particle size of 1 to 600 ⁇ m, preferably 100 to 400 ⁇ m.
  • the self-supporting polyethylene film is advantageously in the form of a polyethylene tape, for. B. made of polyethylene with a melt index of 0.1 to 1.2 g / 10 min, applied. It can be applied to a rotating tube. This has the advantage that the tape can be wound automatically. The bandwidth can be varied as desired. It is z. B. at least 20 mm, expediently 10 to 1500 mm. A range of up to about 1 m is generally used.
  • the layer thickness of the tapes is usually 100 to 400 microns, preferably 100 to 200 microns.
  • the light colored bands are preferably white. However, another color can also be selected as desired, e.g. B. the warning color yellow, but also light orange, light blue, light green or the like. If necessary, the light-colored tapes can also be used to identify the pipes.
  • the speed of the coating can vary within wide limits. It depends on the desired layer thickness, the thickness of the tube wall, the length and the diameter of the tube, the outer tube diameter being 50 to 2000 mm, for example.
  • z. B about 15 to 45, usually about 30 minutes to cool to 60 ° C.
  • the coating of a pipe with a diameter of 400 mm and a layer thickness of 1.5 mm (this is the minimum thickness for adequate corrosion protection) generally requires about 8 to 20, usually about 15 minutes for a 12 m long coating.
  • an additional resin in the form of a polymer, e.g. B. polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid and / or acrylic ester copolymer, optionally with other comonomers, or other polymers, advantageously in a proportion of 5 to 15, preferably 5 to 10 wt .-%, based on the polyethylene powder.
  • a polymer e.g. B. polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-acrylic acid and / or acrylic ester copolymer, optionally with other comonomers, or other polymers, advantageously in a proportion of 5 to 15, preferably 5 to 10 wt .-%, based on the polyethylene powder.
  • this coating can be carried out by the usual coating methods, by spraying, but preferably by powder coating.
  • the same additional resins can also be contained in the polyethylene tape in a proportion of 2 to 5%
  • the tubes coated by the method according to the invention are used in a variety of ways. Because of their surface protection, they are especially for laid pipes, e.g. B. in pipelines for the extraction of petroleum, but also of other gaseous, liquid or highly viscous substances, for example natural gas, water, sewage sludge, concrete, waste water, slurries or the like.
  • Example 2 The same tube as in Example 1 is used, but with a preheating temperature of 310 ° C.
  • the tube is coated with polyethylene powder with a melt index of 1.2 to 1.7 g / 10 min with a layer thickness of 2 mm. After 10 minutes the coating melted smoothly and reached a temperature of 180 ° C. The cooling time to 60 ° C simply by leaving it lying there is 50 minutes.
  • Example 2 The same tube as in Example 2 is used, but with a preheating temperature of 360 ° C.
  • the tube is covered at this temperature with polyethylene powder having a melt index from 1.2 to 1.7 1 1/2 minutes with a layer thickness of 2 mm.
  • the coating melted in the course of 4 minutes and at the same time cooled to 310 ° C. However, reheating is still required for smooth melting. Therefore, after these 4 minutes, the pipe is reheated for one minute. The coating is smooth after this additional minute.
  • the cooling time to 60 ° C from the start of the powder coating and without additional cooling is 42 minutes.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (10)

1. Procédé de revêtement de tubes métalliques par du polyéthylène, dans lequel (a) dans une première étape, on applique sur un tube métallique chauffé un polyéthylène ayant un indice de fusion supérieur à 1 g/10 min, (b) dans une deuxième étape, on diminue la température du tube revêtu et (c) dans une troisième étape on applique un film auto-portant de polyéthylène, caractérisé en ce que (a) dans l'étape 1, on applique sur le tube métallique, qui a une température d'au moins 200°C, un polyéthylène ayant un indice de fusion de 1,2 à 70 g/10 min (190°C/2,16 kg), (b) dans l'étape 2, on refroidit le tube avec son revêtement à une température de 110 à 170°C et (c) dans l'étape 3, on applique à cette température le film auto-portant de polyéthylène jusqu'à ce que l'on obtienne une épaisseur minimum de couche du revêtement total de 1,5 à 4 mm, l'indice de fusion du film, choisi entre 0,1 et 7 g/10 min (190°C2,16kg) étant inférieur à l'indice de fusion choisi pour la première étape.
2. Procédé selon la revendication 1, caractérisé en ce qu'on applique dans la première étape un polyéthylène ayant un indice de fusion de 15 à 70 g/10 min (190°C/2,16 kg).
3. Procédé selon la revendication 1, caractérisé en ce qu'on applique une poudre de polyéthylène, ayant un indice de fusion de 1,2 à 1,7 g/10 min (190°C/2,16kg) ou une bande sortant directement d'une extrudeuse, en un polyéthylène ayant un indice de fusion au plus égal à 1,7 g/10 min (190°C/2,16 kg) sur le tube métallique lequel, dans le cas du revêtement par la poudre, a une température d'au moins 300°C et qui, dans le cas du revêtement par la bande extrudée, a une température maximum de 250° C, et en ce que, dans la troisième étape, on applique un film de couleur claire, stabilisé à la lumière, auto-portant, en un polyéthylène ayant un indice de fusion de 0,4 à 1,1 g/10 min.
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, dans la deuxième étape, on laisse le tube, avec son revêtement, refroidir à 110 à 150° C.
5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que, dans la troisième étape, le revêtement en le polyéthylène ayant l'indice de fusion le plus faible est appliqué sous la forme d'une bande de polyéthylène.
6. Procédé selon la revendication 5, caractérisé en ce que l'application de la bande de polyéthylène est réalisée sur un tube en rotation.
7. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que le revêtement de polyéthylène est appliqué sous la forme d'une bande de polyéthylène blanche d'épaisseur 100 à 200 µm.
8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que, dans la première étape, on applique la poudre de polyéthylène en mélange avec un homopolymé- risat ou un copolymérisat d'acétate de vinyle, en une quantité de préférence comprise entre 5 et 10% en poids par rapport au polyéthylène.
9. Utilisation des tubes préparés par le procédé selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'il s'agit d'une utilisation dans des tuyauteries.
10. Utilisation des tubes selon la revendication 9, caractérisée en ce qu'il s'agit d'une utilisation pour la production du pétrole.
EP80105906A 1979-10-05 1980-09-30 Procédé de revêtement de tuyaux en métal et utilisation desdits tuyaux Expired EP0026906B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105906T ATE4292T1 (de) 1979-10-05 1980-09-30 Verfahren zur beschichtung von metallrohren und verwendung der rohre.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2940388 1979-10-05
DE19792940388 DE2940388A1 (de) 1979-10-05 1979-10-05 Verfahren zur beschichtung von metallrohren
DE19792946459 DE2946459A1 (de) 1979-11-17 1979-11-17 Verfahren zum beschichten von metallrohren
DE2946459 1979-11-17

Publications (2)

Publication Number Publication Date
EP0026906A1 EP0026906A1 (fr) 1981-04-15
EP0026906B1 true EP0026906B1 (fr) 1983-07-27

Family

ID=25781375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105906A Expired EP0026906B1 (fr) 1979-10-05 1980-09-30 Procédé de revêtement de tuyaux en métal et utilisation desdits tuyaux

Country Status (5)

Country Link
US (1) USRE31354E (fr)
EP (1) EP0026906B1 (fr)
CA (1) CA1151017A (fr)
DE (1) DE3064429D1 (fr)
ES (1) ES495475A0 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3101684A1 (de) * 1981-01-21 1982-08-26 Hoechst Ag, 6000 Frankfurt "verfahren zur beschichtung von metallrohren und verwendung der nach diesem verfahren hergestellten rohre"
US4606953A (en) 1983-06-23 1986-08-19 Nippon Steel Corporation Polypropylene coated steel pipe
US5105599A (en) * 1989-02-24 1992-04-21 Highland Supply Corporation Means for securing a decorative cover about a flower pot
DE3444523A1 (de) * 1984-12-06 1986-06-12 Hoesch Ag, 4600 Dortmund Metallrohr mit einer korrosions- und stossschutzbeschichtung und verfahren zu seiner herstellung
US5051285A (en) * 1988-07-29 1991-09-24 Pillard Products, Inc. Plastic piling
US5180531A (en) * 1988-07-29 1993-01-19 Vartkes Borzakian Method of forming plastic piling
US5410856A (en) * 1988-09-26 1995-05-02 Highland Supply Corporation Decorative assembly for a floral grouping
AU668470B2 (en) * 1993-07-12 1996-05-02 Seaward International, Inc. Elongated structural member and method and apparatus for making same
US7882883B2 (en) * 2007-08-06 2011-02-08 Anderson Kenneth K Method for making a barrel front for a paintball marker

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1213977B (de) * 1962-06-22 1966-04-07 Phoenix Rheinrohr Ag Gegen Spannungsriesse bestaendiger Polyaethylenueberzug auf Metalloberflaechen und Verfahren zur Herstellung eines derartigen Polyaethylenueberzuges
US3348995A (en) * 1964-03-09 1967-10-24 American Cast Iron Pipe Co Method of coating metal surfaces with polyethylene utilizing a polyethylene primer and articles produced thereby
DE1228052B (de) * 1965-05-04 1966-11-03 Mannesmann Ag Verbundrohr und Verfahren zur Herstellung
DE1629530B1 (de) * 1966-03-08 1972-05-25 Mannesmann Ag Verfahren zum Herstellen eines aus einem Stahlrohr mit aeusseren Kunststoffschichten bestehenden Verbundrohres
GB1407043A (en) * 1971-09-06 1975-09-24 Sumitomo Metal Ind Method of manufacturing coated steel pipes
GB1482528A (en) * 1973-06-15 1977-08-10 Sumitomo Metal Ind Process for forming coatings on metal surfaces
US4211595A (en) * 1978-10-10 1980-07-08 The Kendall Company Method of coating pipe
US4213486A (en) * 1978-11-06 1980-07-22 The Kendall Company Coated pipe and process for making same
DE2852001A1 (de) * 1978-12-01 1980-06-12 Metallgesellschaft Ag Verfahren zum ummanteln von rotationssymmetrischen, metallischen formkoerpern

Also Published As

Publication number Publication date
ES8106418A1 (es) 1981-07-01
CA1151017A (fr) 1983-08-02
ES495475A0 (es) 1981-07-01
DE3064429D1 (en) 1983-09-01
EP0026906A1 (fr) 1981-04-15
USRE31354E (en) 1983-08-23

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