WO2010057292A1 - Revêtement en poudre fusible polymère sur un article tubulaire allongé - Google Patents

Revêtement en poudre fusible polymère sur un article tubulaire allongé Download PDF

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Publication number
WO2010057292A1
WO2010057292A1 PCT/CA2009/001523 CA2009001523W WO2010057292A1 WO 2010057292 A1 WO2010057292 A1 WO 2010057292A1 CA 2009001523 W CA2009001523 W CA 2009001523W WO 2010057292 A1 WO2010057292 A1 WO 2010057292A1
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WO
WIPO (PCT)
Prior art keywords
coating
heat
article
powder
pressure
Prior art date
Application number
PCT/CA2009/001523
Other languages
English (en)
Inventor
Nicolas Cunningham
Stephen J . Edmondson
Dennis T. H. Wong
Original Assignee
Shawcor Ltd.
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 Shawcor Ltd. filed Critical Shawcor Ltd.
Publication of WO2010057292A1 publication Critical patent/WO2010057292A1/fr

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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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03—Powdery paints
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • 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
    • B05D2451/00—Type of carrier, type of coating (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
    • B05D2504/00—Epoxy polymers
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air
    • 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

Definitions

  • Thick anti-corrosion coatings such as three layer polyethylene are typically applied by extruding a thick film of polyethylene (PE) onto a pipe that has been coated with fusion bonded epoxy (FBE) and adhesive.
  • PE polyethylene
  • FBE fusion bonded epoxy
  • FBE, adhesive and some PE prior to applying the polyethylene sheet can overcome this problem, however this entails adding an additional layer of PE (to give a total of four layers) which can add cost.
  • a preferred solution may be to apply a two layer system comprising FBE followed by only one layer of a modified polyolefin to the FBE, as described in our Canadian patent application number 2,632,802 filed May 30, 2008.
  • applying a two layer system may give a limitation with respect to the thickness that can be achieved, and hence a limitation as to the resistance to impact damage that can be achieved.
  • a thin coat of the modified polyolefin outer layer is applied for example 0.25 mm thick, it will not give the same protection to damage as a conventional three layer coating but may be easier to apply.
  • a thicker coating, for example greater than 0.7 mm thick, of the modified polyolefin is applied it may form a textured appearance, which will contain voids, and may have poor anti-corrosion properties and poor resistance to moisture .
  • the present invention provides a method for applying a polymeric heat bondable powder coating on an elongate tubular article having a surface extending circumferentially around the article, comprising heating the article to a temperature at which the powder bonds to the surface, spray applying the powder to the surface of the article while hot and permitting the powder to bond to the surface to form a coating on said surface, and applying heat or pressure or heat and pressure, the pressure applied uniformly on the whole of the coating on the surface, thereby densifying the coating, and permitting the coated article to cool.
  • the heat or uniform pressure or heat and pressure can cause the coating to flow and form a practically void free film.
  • the above-mentioned surface extends around the entire circumference of the article.
  • a fusion bonded epoxy coating is applied to an exterior surface of the article before said polymeric heat bondable powder is applied.
  • a final product obtainable with the method of the present invention has a thick two layer coating with minimal voids present, good weld coverage and good moisture resistance, providing a viable alternative to a conventional three layer polyethylene coating.
  • heating is applied to densify the coating
  • any conventional heating technique may be employed.
  • the heat is applied by directing radiant heat at the surface of the coating and, preferably, the heat is applied uniformly on the whole of the coating.
  • the radiant heat is infrared radiation.
  • heat and pressure are applied by playing a jet of hot gas on the coating, and, preferably, the heat and pressure are applied uniformly on the whole of the coating.
  • the jet of hot gas may be, for example a jet of hot air, from a hot air blower or hot air knife.
  • a hot air knife is that by directing the flow of hot air, it is possible to force the coating to flow in a desired direction, because of the pressure applied by the hot gas impacting on the molten coating. More preferably, pressure is applied uniformly to the coating using solid rollers that are biased toward the surface of the article.
  • solid rollers made of material such as silicon rubber, fluoroelastomer, such as Viton (trade-mark for fluoroelastomer available from DuPont Canada, Mississauga, Ontario) , and of fluorinated ethylene rubber are used to apply pressure uniformly to a powder coating that has been sprayed on an article, usually a metal article, such as a pipe.
  • fluoroelastomer such as Viton (trade-mark for fluoroelastomer available from DuPont Canada, Mississauga, Ontario)
  • fluorinated ethylene rubber are used to apply pressure uniformly to a powder coating that has been sprayed on an article, usually a metal article, such as a pipe.
  • Trzecieski et al particularly with reference to Figures 5 and 6 of Trnovaeski et al ' s patent, and in U.S. Patent No. 3,868,265, Sakai, et al, granted February 25, 1975, and the disclosures of both of these patents is incorporated herein by reference.
  • the use of polymeric powder coatings that have excessively good flow properties when applied to a hot surface is avoided.
  • Such powder materials may give rise to a problem of the coating tending to sag under the influence of gravity down the side of the tubular article if applied as a thick, for example greater than 0.7 mm thick, coating.
  • One of ordinary skill in the art will readily determine by simple trial and experiment whether a given polymeric material has such excessively good flow properties that it may give rise to a sagging problem.
  • a polymeric powder coating material as described in our above-mentioned Canadian patent application 2,632,802 is employed in carrying out the present invention. It will be appreciated, however, that the invention is by no means limited to such material and other polymeric fusible powder coating materials adapted to be applied to hot tubular articles as coatings in powder form can be used. Such materials are well known to those skilled in the art.
  • the article coated in the present invention comprises metal pipe, usually steel pipe. It will be appreciated, however, that the invention can be employed to advantage for anti-corrosion coating of other elongated tubular articles, for example metal lamp posts, utility poles and pilings.
  • the densified coating has a thickness of 0.5 to 4 mm, more preferably 0.7 to 4 mm, and still more preferably about 1 to 2 mm.
  • Figure 1 shows somewhat schematically a pipe coating process
  • Figure 2 is a cross-section through a portion of a pipe having a densified coating formed in accordance with the method of the invention. The photograph shows an interface with a region to which no pressure has been applied;
  • Figure 3 is a top view of the portion of Fig. 2.
  • Figures 4 to 6 are top views of products obtained as described in Examples 5 and 6 below.
  • arrow 11 indicates the progress of a metal, for example steel, pipe 12 from a zone where the pipe is subjected to surface preparation and heating in conventional manner.
  • the pipe is heated to a temperature making it receptive to polymeric powder coatings.
  • fusion bonded epoxy powder 13 is applied to the hot pipe from an applicator 14.
  • a coating of polymeric powder 16 is applied from an applicator 17. While the coatings are applied, the pipe is spun about its axis, so that the coatings are applied to the entire surface of the length of pipe that is to be coated. Rollers 18, such as those described in
  • Trzecieski U.S. Patent 5,026,451 mentioned above are then applied to the coating provided by the polymeric powder 16 in order to densify the coating.
  • the assembly of rollers may preferably be spun so that it rotates along with the pipe.
  • the densified coating may be subjected to a curing treatment at station 19, for example as described in our above-mentioned patent application No. 2,632,802.
  • the pipe is then passed along the path indicated by the arrow 21 in Figure 1 to a conventional cooling zone, where the hot coating is cooled, for example by application of a water quench.
  • the rollers 18 have a Shore A hardness of 18, more preferably between 5 and 35, and still more preferably between 15 and 20 measured in accordance with ASTM D 2240-05.
  • the rollers 18 may be cooled to limit their surface temperature by using an internal or external cooling system.
  • the rollers 18 may be made of a single piece, or may be made of distinct pieces joined together with a flexible or articulated joint.
  • panels were employed, simulating a receptive surface of a tubular article.
  • Grit blasted steel panels were etched with a weak solution of phosphoric acid (5%vol/vol) and thoroughly rinsed using deionized water.
  • the panels were preheated to a temperature of about 240 0 C.
  • a 0.2 to 0.3 mm thick layer of Scotchkote (trade-mark) 6233 HG fusion bond epoxy (FBE) from 3M was applied to the outside of the thus heated panels. At which point the surface temperature of the panels had dropped to about 230 0 C.
  • a topcoat layer of a coating as described in above-mentioned Canadian patent application 2,632,802 was then sprayed unto the gelling layer of FBE.
  • the topcoat was sprayed until the desired thickness was achieved and immediately thereafter, a roller made of silicone rubber was manually rolled across the surface of the topcoat.
  • the coating can be reheated to ensure complete curing to simulate post-cure in a plant environment .
  • a 24 inch diameter steel pipe was first sandblasted and cleaned of remaining blasting media. It was mounted on a pipe rotator able to maintain 15 revolutions per minutes (rpm) .
  • a propane heating torch was inserted inside the pipe and the pipe heated to a temperature of about 240 0 C at which point the torch was removed.
  • a 0.2 to 0.3 mm thick layer of Scotchkote 6233 HG fusion bond epoxy (FBE) was applied to the outside of the thus heated pipe. At which point the surface temperature of the pipe had dropped to about 230 0 C.
  • a topcoat layer of the same coating material used in Example 1 was then sprayed unto the gelling layer of FBE.
  • topcoat was sprayed until the desired thickness was achieved and immediately thereafter, a roller made of silicone rubber was lowered unto the surface of the topcoat. During the whole spraying process, the pipe kept rotating at 15 rpm. The roller was left in contact with the topcoat for no more than 1 minute and was then lifted out of contact with the pipe.
  • Steel panels were grit blasted and thermally pickled in conventional manner.
  • the panels were preheated in an oven to 240 0 C and a 0.2 to 0.3 mm thick layer of the compounded mixture particles of Example 3 was sprayed using a modified spray gun fitted with a small funnel.
  • the panels were then immediately placed back in the oven maintained at 240 0 C for a period of no less than 3 minutes and then dipped in a bucket of water at room temperature.
  • Steel panels were grit blasted and thermally pickled in conventional manner.
  • the panels were preheated in an oven to 240 0 C and a 0.2 to 0.3 mm thick layer of the compounded mixture particles of Example 3 was sprayed using a modified spray gun fitted with a small funnel. Pressure was applied using a silicone roller of 18 Shore A hardness that was rolled once over the freshly sprayed powder. The plate was then placed back in the oven maintained at 240 0 C for a period of no less than 3 minutes and then dipped in a bucket of water at room temperature.
  • Example 2 was repeated except a topcoat layer of coating material of Composition 1 ground in such a way as to ensure that all the powder passed through a 300 micron sieve was employed.
  • Figure 2 shows a cross-section of the product having a steel substrate 22, an FBE layer 23 and a topcoat layer 24.
  • Fig. 2 there is visible on the left a region 26 that was untouched by the roller and on the right a region 27 that was compacted under the roller.
  • the region 27, 27a that was under the roller is obviously smoother and denser and possessed less surface defects than the region 26, 26a not compressed by the roller .
  • Example 3a A sample was prepared and sprayed according to the method described in Example 3a, however, a jet of hot air at about 500 0 C was applied on the freshly sprayed surface.
  • arrow 28 represents the approximate direction of the hot air jet (from the bottom left corner to the top right corner) .
  • a sample was prepared and sprayed according to the method described in Example 3a.
  • a top view of the product is seen in Figure 5.
  • a second sample was prepared according to the method described in Example 3a but immediately after spraying the plate was exposed to IR for a period of 30 seconds.
  • a top view of the product is seen in Figure 6.
  • Re su lt s Re su lt s :

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention porte sur un procédé pour appliquer un revêtement en poudre polymère pouvant être lié par la chaleur sur un article tubulaire allongé ayant une surface s'étendant de manière circonférentielle autour de l'article, par exemple un tuyau. L'article est chauffé à une température à laquelle la poudre adhère à la surface. La poudre est appliquée par pulvérisation sur la surface de l'article lorsqu'elle est chaude, et on laisse la poudre adhérer à la surface de façon à former un revêtement sur la surface. Une chaleur ou une pression, ou une chaleur et une pression, sont appliquées. La pression est appliquée uniformément sur l'ensemble du revêtement sur la surface afin de densifier le revêtement. On laisse ensuite refroidir l'article revêtu.
PCT/CA2009/001523 2008-11-24 2009-10-29 Revêtement en poudre fusible polymère sur un article tubulaire allongé WO2010057292A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,644,625 2008-11-24
CA 2644625 CA2644625A1 (fr) 2008-11-24 2008-11-24 Revetement polymerique de poudre fusible sur article tubulaire allonge

Publications (1)

Publication Number Publication Date
WO2010057292A1 true WO2010057292A1 (fr) 2010-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2009/001523 WO2010057292A1 (fr) 2008-11-24 2009-10-29 Revêtement en poudre fusible polymère sur un article tubulaire allongé

Country Status (2)

Country Link
CA (1) CA2644625A1 (fr)
WO (1) WO2010057292A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868265A (en) * 1971-09-06 1975-02-25 Sumitomo Metal Ind Method of manufacturing coated steel pipes
CA1058019A (fr) * 1975-08-14 1979-07-10 Arthur E. Ostrowski Production de tubes d'acier recouverts de polymeres
CA2642093A1 (fr) * 2006-02-22 2007-08-30 Shawcor Ltd. Procede de revetement pour tube comportant un cordon de soudure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868265A (en) * 1971-09-06 1975-02-25 Sumitomo Metal Ind Method of manufacturing coated steel pipes
CA1058019A (fr) * 1975-08-14 1979-07-10 Arthur E. Ostrowski Production de tubes d'acier recouverts de polymeres
CA2642093A1 (fr) * 2006-02-22 2007-08-30 Shawcor Ltd. Procede de revetement pour tube comportant un cordon de soudure

Also Published As

Publication number Publication date
CA2644625A1 (fr) 2010-05-24

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