UST973015I4 - Cathodically protected polyolefin coated pipelines - Google Patents
Cathodically protected polyolefin coated pipelines Download PDFInfo
- Publication number
- UST973015I4 UST973015I4 US05/836,570 US83657077A UST973015I4 US T973015 I4 UST973015 I4 US T973015I4 US 83657077 A US83657077 A US 83657077A US T973015 I4 UST973015 I4 US T973015I4
- Authority
- US
- United States
- Prior art keywords
- polyolefin
- epoxy resin
- pipe
- density polyethylene
- weight
- 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.)
- Pending
Links
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
- B05D7/148—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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
- Y10T428/1359—Three or more layers [continuous layer]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31511—Of epoxy ether
- Y10T428/31529—Next to metal
Abstract
the resistance to stress cracking or cathodic disbonding of an external polyolefin coating on a cathodically protected pipeline, especially a steel pipe for conveying fuel gas at high pressure, is improved by including 1-18%, preferably 4-8%, by weight, based on the polyolefin, of cured epoxy resin in at least the region of the polyolefin coating adjacent the pipe. The concentration of cured epoxy resin may be uniform throughout, or the coating may comprise a primer layer of polyolefin containing the epoxy resin adjacent the pipe and an outer layer of polyolefin containing no epoxy resin.
Suitably cured epoxy resins are described in Kirk-Othmer Encyclopedia of Chemical Technology 2nd Ed. Vol. 8, pp. 294-312. The polyolefin is preferably low-density polyethylene but may also be an ethylene copolymer, high-density polyethylene, polypropylene or a propylene copolymer with up to 20% by weight of ethylene. Its melt flow index is preferably 0.1-200 when used as primer and 0.1-2 otherwise (units g/10 min. measured according to British Standard 2782:Part 1/105C/1976 using 2-16 kg load and for propylene polymers performed at 230° C. instead of 190° C.). Stabilizers, especially antioxidants, pigments such as carbon black, e.g. 1-5% by weight and peroxy cross-linking agents may also be included in the polyolefin compositions.
The powdered composition may be coated by electrostatic spraying onto the heated pipe, e.g. at 190° C. for low-density polyethylene, with possible subsequent application by extrusion or otherwise of polyolefin containing no epoxy resin. It may alternatively be strew-coated onto the pipe heated to a higher temperature, e.g. 320° C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2719077 | 1977-06-29 | ||
| GB27190/77 | 1977-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST973015I4 true UST973015I4 (en) | 1978-08-01 |
Family
ID=10255660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/836,570 Pending UST973015I4 (en) | 1977-06-29 | 1977-09-26 | Cathodically protected polyolefin coated pipelines |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST973015I4 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300336A (en) * | 1990-12-21 | 1994-04-05 | Shaw Industries Ltd. | High performance composite coating |
| US20070036982A1 (en) * | 2005-08-11 | 2007-02-15 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
| US20070034316A1 (en) * | 2005-08-11 | 2007-02-15 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
-
1977
- 1977-09-26 US US05/836,570 patent/UST973015I4/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5300336A (en) * | 1990-12-21 | 1994-04-05 | Shaw Industries Ltd. | High performance composite coating |
| US20070036982A1 (en) * | 2005-08-11 | 2007-02-15 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
| US20070034316A1 (en) * | 2005-08-11 | 2007-02-15 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
| US7790288B2 (en) | 2005-08-11 | 2010-09-07 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
| US8231943B2 (en) | 2005-08-11 | 2012-07-31 | 3M Innovative Properties Company | Interpenetrating polymer network as coating for metal substrate and method therefor |
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