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EP2181284A2 - Umhüllte rohrleitung - Google Patents

Umhüllte rohrleitung

Info

Publication number
EP2181284A2
EP2181284A2 EP08787512A EP08787512A EP2181284A2 EP 2181284 A2 EP2181284 A2 EP 2181284A2 EP 08787512 A EP08787512 A EP 08787512A EP 08787512 A EP08787512 A EP 08787512A EP 2181284 A2 EP2181284 A2 EP 2181284A2
Authority
EP
European Patent Office
Prior art keywords
polyamide
layer
use according
polyamide molding
compound
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.)
Ceased
Application number
EP08787512A
Other languages
German (de)
English (en)
French (fr)
Inventor
Andreas Dowe
Rainer Göring
Martin Risthaus
Klaus Gahlmann
Reinhard BÜSSING
Hans-Jürgen KOCKS
Jörn WINKELS
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.)
Salzgitter Mannesmann Line Pipe GmbH
Evonik Operations GmbH
Original Assignee
Evonik Degussa GmbH
Salzgitter Mannesmann Line Pipe GmbH
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 Evonik Degussa GmbH, Salzgitter Mannesmann Line Pipe GmbH filed Critical Evonik Degussa GmbH
Publication of EP2181284A2 publication Critical patent/EP2181284A2/de
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/109—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being an extruded layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics

Definitions

  • the invention relates to the use of a metallic conduit whose surface is coated with a polyamide layer, for the production of a trenchless or sand bed laid pipe, and the pipeline produced in this way.
  • Metal supply, disposal or product lines are currently used, for example, with a polyolefin such.
  • a polyolefin such as Polyethylene or polypropylene (WO 2002/094922, US 2002/0066491, EP-A-0346101).
  • the coatings or coatings serve primarily for corrosion protection; they are described by appropriate standards. For the
  • Another prior art which is governed by the DIN EN 10310 (German version EN 10310: 2003), provides for the coating of steel pipes for pipelines buried by water and ground using polyamide powder.
  • the polyamide coating is applied by immersion in a Fluidadbett, spraying or rolling application process. Due to the process can be applied by powder coating only relatively thin layers on the metal, which are unsuitable for a trenchless installation of pipelines.
  • a particular disadvantage is that for the coating, a powder of a relatively low molecular weight polyamide must be used in order to ensure a good flow of the melt on the hot metal surface. However, a coating thus obtained has insufficient mechanical strength; It is primarily used for corrosion protection.
  • a particular disadvantage is that in this way it is not possible to apply a polyamide layer to a tube which already contains a coating of a polyolefin or a bonding agent layer.
  • thermosetting coatings based on epoxide or polyurethane are known; they only serve to protect against corrosion and do not provide any protection against mechanical damage.
  • the applied according to the prior art corrosion protection is not sufficiently mechanically resistant.
  • the polymer layer is locally damaged in such a way that the metal comes into contact with water. Due to the onset of corrosion, the service life of the pipeline is considerably reduced. The same applies z.
  • Pipelines with such anti-corrosive coatings must be embedded in stone-free material. In the prior art, such coated or sheathed pipes are often protected by an additionally applied cement mortar casing from mechanical damage.
  • the cement mortar layer is applied in a separate operation. After applying the mortar layer, it must harden for at least five days before the pipes can be handled further. This step is therefore very time-consuming and thus cost-intensive.
  • the state of the art for mortar coating can be found, for example, in the following documents: US Pat. No. 5,580,659, DE 42 08 047 C1, DE 42 01 113 C1, DE 33 05 158 A1, US Pat. No. 4,454,172 and US Pat. No. 4,361,336. Nationally, the requirements are the cement mortar coating is regulated in DVGW Worksheet GW 340. However, such mortar layers increase the weight of the pipes considerably; This makes handling more difficult. The weight-dependent loading capacity of the transport vehicles also decreases.
  • the object of the invention is therefore to provide a coated metallic conduit available, even without additional protective measures under mechanical stress, for. B. in a trenchless or sand bed-free installation, the integrity of the coating maintains, so that the metal tube is effectively protected against corrosion. In addition, a firm adhesion to the pipe or to any existing coatings should be achieved. Overall, a pipe is to be provided which is easy to handle and inexpensive to produce.
  • underground also includes the laying in the bottom of a body of water, eg in the seabed.
  • the tube consists for example of steel, stainless steel, copper, aluminum, cast iron, galvanized steel, with metal alloys such. GALFAN coated steel or any other metal.
  • the tube can be made by any method of the prior art.
  • the polyamide can be prepared from a combination of diamine and dicarboxylic acid, from a CO-amino carboxylic acid or the corresponding lactam.
  • any polyamide may be used, for example PA46, PA6, PA66 or copolyamides based thereon with units derived from terephthalic acid and / or isophthalic acid (generally referred to as PPA).
  • PPA isophthalic acid
  • the monomer units contain on average at least 8, at least 9 or at least 10 C atoms. For mixtures of lactams, the arithmetic mean is considered here.
  • Suitable polyamides are, for example: PA610 (preparable from hexamethylenediamine [6 C atoms] and sebacic acid [10 C atoms], the average of the C atoms in the monomer units here is 8), PA88 (preparable from octamethylenediamine and 1.8-octanedioic acid) , PA8 (made from capryllactam), PA612, PA810, PA108, PA9, PA613, PA614, PA812, PA128, PA101, PA10, PA814, PA148, PA1012, PAI1, PA1014, PA1212 and PA12.
  • PA610 preparable from hexamethylenediamine [6 C atoms] and sebacic acid [10 C atoms], the average of the C atoms in the monomer units here is 8
  • PA88 preparable from octamethylenediamine and 1.8-octanedioic acid
  • PA8 made from capryllactam
  • the polyamide may also be a polyetheresteramide or a polyetheramide.
  • Polyetheramides are in principle z. B. from DE-OS 30 06 961 known. They contain a polyether diamine as comonomer. Suitable polyether diamines are obtained by conversion of the corresponding polyether diols by reductive amination or coupling to acrylonitrile with subsequent hydrogenation accessible (eg EP-A-0 434 244, EP-A-0 296 852). They usually have a number average molecular weight of 230 to 4000; their proportion of the polyetheramide is preferably 5 to 50 wt .-%.
  • polyetherdiamines based on 1,4-butanediol or 1,3-butanediol or mixed polyetherdiamines, for example with random or with blockwise distribution of the units derived from the diols, are also very suitable.
  • Polyetheramides are preferred here.
  • the molding composition may contain other components such.
  • impact modifiers other thermoplastics, plasticizers and other conventional additives. It is only necessary that the polyamide forms the matrix of the molding compound.
  • Suitable impact modifiers are ethylene / ⁇ -olefin copolymers, preferably selected from a) ethylene / C 3 - to C 2 - ⁇ -olefin copolymer with 20 to 96, preferably 25 to 85 wt .-% ethylene.
  • C3-Ci 2 -O-01efin for example, propene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene or 1-dodecene is used. Typical examples of this are ethylene
  • ethylene / C 3 - to C 2 - ⁇ -olefin / unconjugated diene terpolymer having 20 to 96, preferably From 25 to 85% by weight of ethylene and up to a maximum of about 10% by weight of an unconjugated diene such as bicyclo (2.2.1) heptadiene, hexadiene-1,4, dicyclopentadiene or 5-ethylidenenorbornene.
  • an unconjugated diene such as bicyclo (2.2.1) heptadiene, hexadiene-1,4, dicyclopentadiene or 5-ethylidenenorbornene.
  • C 3 - to C 2 -CC-OIeFm are also, for example, propene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene or 1-dodecene suitable.
  • styrene-ethylene / butylene block copolymers Other suitable impact modifiers are styrene-ethylene / butylene block copolymers.
  • Styrene-ethylene / butylene-styrene block copolymers SEBS
  • SEB diblock systems
  • Such block copolymers are state of the art.
  • impact modifiers preferably contain acid anhydride groups which are introduced in a known manner by thermal or radical reaction of the main chain polymer with an unsaturated dicarboxylic acid anhydride, an unsaturated dicarboxylic acid or an unsaturated dicarboxylic monoalkyl ester in a concentration which is sufficient for a good attachment to the polyamide.
  • Suitable reagents are, for example, maleic acid, maleic anhydride, monobutyl maleate, fumaric acid, citraconic anhydride, aconitic acid or itaconic anhydride.
  • preferably 0.1 to 4 wt .-% of an unsaturated anhydride are grafted to the impact modifier.
  • the unsaturated dicarboxylic acid anhydride or its precursor may also be grafted together with another unsaturated monomer such as styrene, CC-methylstyrene or indene.
  • Suitable impact modifiers are copolymers containing units of the following monomers: a) 20 to 94.5% by weight of one or more ⁇ -olefins having 2 to 12 carbon atoms, b) 5 to 79.5% by weight of one or more acrylic compounds selected from
  • Acrylic acid or methacrylic acid or their salts are Acrylic acid or methacrylic acid or their salts
  • esters of acrylic acid or methacrylic acid with a C 1 to C 12 alcohol may optionally bear a free hydroxyl or epoxide function
  • This copolymer is composed for example of the following monomers, this list is not exhaustive: a) ⁇ -olefins such as ethylene, propene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene or 1-dodecene ; b) acrylic acid, methacrylic acid or salts thereof, for example with Na ® or Zn 2 ⁇ as counterion; Methylacrylate, ethylacrylate, n-propylacrylate, n-butylacrylate, isobutylacrylate, n-hexylacrylate, n-octylacrylate, 2-ethylhexylacrylate, isononylacrylate, dodecylacrylate, methylmethacrylate, ethylmethacrylate, n-propylmethacrylate, n-butylmethacrylate, isobutylmethacrylate, 2-ethyl
  • the copolymer contains units of the following monomers:
  • Acrylic acid or methacrylic acid or their salts are Acrylic acid or methacrylic acid or their salts
  • the copolymer may contain a small amount of other copolymerized monomers, provided they do not appreciably affect the properties, such as
  • the molding composition of the layer according to I. hereby contains the following components:
  • Acrylic acid or methacrylic acid or their salts Esters of acrylic acid or methacrylic acid with a Ci to Ci2-alcohol, which may optionally carry a free hydroxyl or epoxy function, acrylonitrile or methacrylonitrile, acrylamides or methacrylamides, c) 0.5 to 50 wt .-% of an olef ⁇ nischunsaturated Epoxides, carboxylic acid anhydrides,
  • the molding composition in this case contains:
  • the copolymer which preferably contains units of the following monomers: a) 30 to 80% by weight of ⁇ -olefin (e), b) from 7 to 70% by weight and particularly preferably from 10 to 60% by weight of the acrylic compound (s), c) from 1 to 40% by weight and particularly preferably from 5 to 30% by weight of the olefinically unsaturated epoxide, Carboxylic anhydrides, carboximides, oxazolines or
  • nitrile rubber NBR
  • H-NBR hydrogenated nitrile rubber
  • Corresponding molding compositions are described in US2003 / 0220449A1.
  • thermoplastics which may be included in the molding composition of the layer according to I. are primarily polyolefins. In one embodiment, as described above for the impact modifiers, they may contain acid anhydride groups and then optionally be present together with an unfunctionalized impact modifier. In another
  • Embodiment they are not functionalized and are present in the molding compound in combination with a functionalized impact modifier or a functionalized polyolefin.
  • a functionalized impact modifier or a functionalized polyolefin are provided with groups which can react with the polyamide end groups, for example acid anhydride groups, carboxyl groups, epoxide groups or oxazoline groups.
  • the polyolefin is, for example, polyethylene or polypropylene.
  • any commercially available type can be used.
  • the polyolefin can be prepared by any known method, for example by Ziegler-Natta, by the Phillips method, by means of metallocenes or radically.
  • the polyamide in this case may also be, for example, PA6 and / or PA66.
  • the molding composition contains from 1 to 25% by weight of plasticizer, more preferably from 2 to 20% by weight, and especially preferably from 3 to 15% by weight.
  • Plasticizers and their use in polyamides are known.
  • a general overview of plasticizers which are suitable for polyamides can be found in Gumbleter / Müller, Kunststoffadditive, C. Hanser Verlag, 2nd Edition, p. 296.
  • plasticizers suitable conventional compounds are, for. B. esters of p-hydroxybenzoic acid having 2 to 20 carbon atoms in the alcohol component or amides of arylsulfonic acids having 2 to 12 carbon atoms in the amine component, preferably amides of benzenesulfonic acid.
  • Plasticizers include, for example, p-hydroxybenzoic acid ethyl ester, octyl p-hydroxybenzoate, isobutyl p-hydroxybenzoate, n-octyltoluene toluenesulfonate, benzene sulfonic acid-n-butylamide or benzenesulfonic acid 2-ethylhexylamide in question.
  • the molding compound may still contain conventional amounts of additives needed to adjust certain properties.
  • additives such as carbon black, titanium dioxide, zinc sulfide, silicates or carbonates, reinforcing fibers such as e.g. Glass fibers, processing aids such as waxes, zinc stearate or calcium stearate, flame retardants such as magnesium hydroxide, aluminum hydroxide or melamine cyanurate, antioxidants, UV stabilizers and additives that give the product anti-electrostatic properties or electrical conductivity such.
  • carbon fibers graphite fibrils, stainless steel fibers or conductive carbon black.
  • a good mechanical resistance of the polyamide coating is obtained in particular if the viscosity of the applied polyamide molding compound at 240 ° C. and a shear rate of 0.1 l / s is at least 2000 Pas, preferably at least 2300 Pas, particularly preferably at least 3000 Pa. s, more preferably at least 5000 Pa-s and most preferably at least 8000 Pa-s.
  • the viscosity is determined in a cone and plate viscometer according to ASTM D 4440-3.
  • a high viscosity of the polyamide molding composition is usually associated with a high molecular weight of the polyamide.
  • a measure of the molecular weight of the polyamide is the solution viscosity. In the context of the invention it is preferred that the relative
  • Solution viscosity ⁇ re i of the polyamide in the applied molding composition measured in a 0.5 wt .-% solution in m-cresol at 23 0 C according to ISO 307, at least 1.8, more preferably at least 2.0, most preferably at least 2.1, and most preferably at least 2.2.
  • a known method for producing such polyamides is the solid phase postcondensation of granulated low viscosity polyamides to high viscosity polyamide at a temperature lower than the melting temperature.
  • the process is described, for example, in CH 359 286 and US Pat. No. 3,821,171.
  • solid phase postcondensation of polyamides is carried out in a batch or continuous dryer under inert gas or vacuum. This method allows the production of very high molecular weight polyamides.
  • Another possibility for producing high-viscosity polyamides is the continuous post-condensation in the melt using various screw apparatus.
  • WO 2006/079890 states that high-viscosity polyamide molding compositions can be obtained by mixing a high molecular weight polyamide and a low molecular weight polyamide.
  • the molding compositions produced according to this prior art usually require a very high current consumption or a very high torque during the extrusion and the pressure at the nozzle is very high.
  • perceptible chain scission occurs at the high shear forces, resulting in a reduction in molecular weight during processing.
  • the polyamide molding compound prefferably condensed only during the processing operation with the aid of an additive which builds up the molecular weight.
  • the invention therefore also relates to the use according to the claims of a tube, wherein the extruded layer of a polyamide molding compound was applied by means of the following method steps:
  • a polyamide molding compound was provided; b) a premix of the polyamide molding composition and the constituent additive, for example a compound having at least two carbonate units was prepared, c) the mixture was optionally stored and / or transported and d) the mixture was then used for extrusion, in which only in this step Condensation took place.
  • the starting compounds preferably have molecular weights M n greater than 5000, in particular greater than 8000.
  • polyamides are used whose end groups are at least partially present as amino groups. For example, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80% or at least 90% of the end groups are present as amino end groups.
  • the preparation of polyamides having a higher amino terminal content using diamines or polyamines as regulators is state of the art.
  • an aliphatic, cycloaliphatic or araliphatic diamine having 4 to 44 carbon atoms is preferably used as regulator in the preparation of the polyamide.
  • Suitable diamines are hexamethylenediamine, decamethylenediamine, 2,2,4- and 2,4,4-trimethylhexamethylenediamine, dodecamethylenediamine, 1,4-diaminocyclohexane, 1,4- or 1,3-dimethylaminocyclohexane, 4,4'-diaminodicyclohexylmethane, 4,4'-diamino-3,3'-dimethyldicyclohexylmethane, 4.4'-diaminodicyclohexylpropane, isophoronediamine, metaxylylenediamine or paraxylylenediamine.
  • a polyamine is used as regulator and simultaneously branching agent in the preparation of the polyamide.
  • these are diethylenetriamine, 1,5-diamino-3- ( ⁇ -aminoethyl) pentane, tris (2-aminoethyl) amine, N, N-bis (2-aminoethyl) -N ', N' to [2- [bis (2 aminoethyl) amino] ethyl] -1,2-ethanediamine, dendrimers and also polyethyleneimines, in particular branched polyethyleneimines obtainable by polymerization of aziridines (Houben-Weyl, Methods of Organic Chemistry, Volume E20, pages 1482-1487, Georg Thieme Verlag Stuttgart, 1987) and generally have the following amino group distribution:
  • the compound having at least two carbonate units is used in an amount ratio of 0.005 to 10% by weight, calculated in relation to the polyamide used. Preferably, this ratio is in the range of 0.01 to 5.0 wt .-%, particularly preferably in the range of 0.05 to 3 wt .-%.
  • carbonate here means esters of carbonic acid, in particular with phenols or alcohols.
  • the compound having at least two carbonate units may be low molecular weight, oligomeric or polymeric. It may consist entirely of carbonate units or it may have other units. These are preferably oligo- or polyamide, ester, ether, ether esteramide or ether amide units. Such compounds can be prepared by known oligo- or polymerization processes or by polymer-analogous reactions.
  • the compound having at least two carbonate units is a polycarbonate, for example based on bisphenol A, or a block copolymer containing such a polycarbonate block.
  • the metered addition of the compound used as additive with at least two carbonate units in the form of a masterbatch allows a more accurate metering of the additive, since larger amounts are used. It also turned out that the use of a masterbatch improves the quality of the extrudate.
  • the masterbatch comprises as matrix material preferably the polyamide, which is also condensed in the process according to the invention, or a polyamide compatible therewith, but also incompatible polyamides can undergo a partial binding to the polyamide to be condensed under the reaction conditions, which causes compatibilization.
  • the polyamide used as the matrix material in the masterbatch preferably has a molecular weight M n of greater than 5000 and in particular greater than 8000.
  • Preferred polyamides are those whose end groups are present predominantly as carboxylic acid groups. For example, at least 80%, at least 90% or at least 95% of the end groups are acid groups.
  • the concentration of the compound having at least two carbonate units in the masterbatch is preferably 0.15 to 50 wt .-%, particularly preferably 0.2 to 25 wt .-% and particularly preferably 0.3 to 15 wt .-%.
  • the preparation of such a masterbatch takes place in the usual manner known to those skilled in the art.
  • Suitable compounds having at least two carbonate units and suitable masterbatches are described in detail in WO 00/66650, to which reference is expressly made.
  • the invention is applicable to polyamides which contain at least 5 ppm of phosphorus in the form of an acidic compound due to their production.
  • the polyamide molding compound prior to compounding or compounding 0.001 to 10 wt .-%, based on the polyamide, of a salt of a weak acid added.
  • Suitable salts are disclosed in DE-A 103 37 707, to which reference is hereby expressly made.
  • the invention is equally applicable to polyamides, which contain less than 5 ppm of phosphorus or no phosphorus in the form of an acidic compound due to its production. In this case, although not a corresponding salt of a weak acid must be added.
  • the compound having at least two carbonate units as such or as a masterbatch preferably after compounding, that is, only after the preparation of the
  • the polyamide to be condensed or the polyamide molding compound to be condensed are preferably mixed as granules with the granules or powder of the compound having at least two carbonate units or the corresponding masterbatch.
  • the masterbatch may as well be as well
  • Melting stream are metered by means of a extruder provided in the melt of the polyamide molding compound to be processed and then thoroughly mixed.
  • any other suitable constituting additive may also be used, for example one disclosed in the above-mentioned literature.
  • Suitable proportions are also 0.005 to 10 wt .-%, calculated in relation to the polyamide used, preferably 0.01 to 5.0 wt .-%, particularly preferably 0.05 to 3 wt .-%.
  • the applied polyamide layer must be at least so thick that it can be produced under the conditions of application as a closed layer.
  • the layer thickness is at least 1.0 mm, more preferably at least 1.2 mm, and most preferably at least 1.4 mm.
  • the polyamide layer can be applied directly to the metal surface. In general, however, at least one further layer is located between the metal surface and the polyamide layer. For example, these can be the following layers:
  • a ceramic layer for example according to WO 03/093374;
  • a primer layer for example of epoxy resin (US Pat. No. 5,580,659) or a water-based mixture of epoxy resin and polyacrylate latex (WO 00/04106);
  • a layer of a polyolefin bearing functional groups a layer of a polyolefin bearing functional groups.
  • suitable functional groups are carboxyl groups or acid anhydride groups (WO 02/094922),
  • Epoxy groups or alkoxysilane groups (EP-A-0 346 101) in question.
  • the polyolefin layer can also be foamed.
  • the polyolefin is preferably polyethylene or polypropylene;
  • a textile reinforcement in the form of fabric or mats for example of glass fibers or aramid fibers (Kevlar).
  • Preferred layer arrangements are as follows: metal / ceramic layer / polyamide layer;
  • At least one further layer can adjoin the outside of the polyamide layer, for example a foam jacket for thermal insulation.
  • Any ceramic layer, primer layer and / or polyolefin layer is applied to the tube by any method. Suitable methods are state of the art.
  • the polyamide layer is applied as it is for the Polyolefm slaughter prior art, for example by means of tubular or Wickelextrusion.
  • the polyamide layer can be produced and applied together with a polyolefin layer likewise to be applied by coextrusion of a multilayer composite.
  • the outer diameter of the metal tube is preferably at least 25 mm and at most 4800 mm and more preferably at least 32 mm and at most 2500 or 1500 mm.
  • the individual pieces of the pipe are connected as intended to a pipeline.
  • the pipeline in question may be a transport line, a distribution line or a service line and be designed either as a pressure line or as a gravity pipe. It is used for example for the transport of district heating, fresh water, waste water, gas, air, oils such as crude oil, light oil or heavy oil, fuels such as kerosene or diesel, petrochemicals, brine, alkalis, abrasive media, mining or injection materials or dusts and can, for example be a supply or disposal line.
  • the pipeline is laid by known methods trenchless and / or sand bed-free.
  • the Horizontal Directional Drilling (HDD) process is a trenchless pipeline construction process in which a controlled pilot hole is first propelled along the route to be drilled, then widened in one or more passes, after which the pipeline is retrieved from the target pit
  • the HDD method is used, for example, for river crossings, crossings of fortified areas, landings in the coastal area or mountain crossings.
  • the state of the art currently allows drilling lengths of up to 3000 m, for example in the DVGW regulations described by the worksheet GW 321.
  • Burstlining is a trenchless pipe renewal process that uses the old one
  • the plow When plowing, the plow cuts a laying slot into the ground with its sword. Displacer elements press the soil apart. In the same step, the tube is inserted into the slot. The pipe section is then immediately closed again. In this method, the laying depth is limited to about 2 meters.
  • Under Microtunneling is understood to be a remote-controlled method for the propulsion of pipes, in which, starting from a start shaft (press pit) by means of a propulsion device with a press and drill head, a sewer pipe is propelled. The soil is thereby reduced by a hydraulically driven drill head.
  • a pumped medium is injected at the drill head (for loose, non-cohesive soil, bentonite liquid, for cohesive or rocky soil, water is sufficient).
  • the overburden is conveyed via screw conveyors and pipes, which run in the already pressed-in pipe, into the press pit and from there upwards (over days). Here is a separation between soil and medium.
  • the pumped medium is then reused.
  • the good Abriebeigenschaften, the very high scratch resistance and the optimum thickness of the applied polyamide layer can be ensured according to the invention at the same time a good corrosion protection and the required for trenchless and sand bed laying techniques resistance resistance of the outer shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Polyamides (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP08787512A 2007-08-29 2008-08-27 Umhüllte rohrleitung Ceased EP2181284A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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AP3042A (en) 2014-11-30
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IL203670A (en) 2016-12-29
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CN101403459A (zh) 2009-04-08
KR20100057829A (ko) 2010-06-01
CN101403459B (zh) 2012-08-15
EA018498B9 (ru) 2014-01-30
MX2010002213A (es) 2010-06-01
EG26875A (en) 2014-11-12
WO2009027429A2 (de) 2009-03-05
ZA201002108B (en) 2010-11-24
CO6300881A2 (es) 2011-07-21
UA103007C2 (uk) 2013-09-10
AU2008292178A1 (en) 2009-03-05
AR068131A1 (es) 2009-11-04
CA2695141A1 (en) 2009-03-05
EA201000376A1 (ru) 2010-08-30
WO2009027429A3 (de) 2009-04-23
CA2695141C (en) 2017-03-28
JP5431327B2 (ja) 2014-03-05
EA018498B1 (ru) 2013-08-30
JP2010536626A (ja) 2010-12-02
US9574700B2 (en) 2017-02-21
KR101560847B1 (ko) 2015-10-15
DE102007040683A1 (de) 2009-03-05
BRPI0815887A2 (pt) 2015-02-24

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