Multilayer plastic anticorrosive coating having improved properties

A coating and coating technology, applied in the direction of coatings, rigid pipes, devices for coating liquids on surfaces, etc., can solve the problems of complex cost, limited output, high processing steps, etc., to improve elasticity and improve incision impact resistance , Improve the effect of impact resistance

Inactive Publication Date: 2008-07-23
BASELL POLYOLEFINE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantage of the above-mentioned outer coating is that an additional complex and costly processing step is required for its manufacture
Not only do silane-crosslinked polyolefins need to be stored in water for several days, it also limits production volumes
Output is further limited by the need for pipes to be stored after the intermediate layer is applied and before the outer layer of polyolefin is applied

Method used

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  • Multilayer plastic anticorrosive coating having improved properties
  • Multilayer plastic anticorrosive coating having improved properties
  • Multilayer plastic anticorrosive coating having improved properties

Examples

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Effect test

example 1

[0090] Grit blasted steel pipes (48 inches in diameter) were heated to 200°C. Then apply the following layers in sequence on this steel pipe:

[0091] - The first layer is a standard resin layer applied by electrostatic spraying treatment with a thickness of 0.12mm;

[0092] - Apply a standard adhesive layer directly on top of the first layer by coating extrusion with a thickness of 0.25 mm;

[0093] - On top of the standard adhesive layer is a standard HDPE top layer material with a thickness of 3mm;

[0094] - Apply a silane-crosslinkable outer layer with a thickness of 1 mm directly onto the still molten PE top layer with a second nozzle.

[0095] This process ensures that the PEX layer is well attached to the previously applied layer of thermoplastic PE. Since the PEX layer is not yet crosslinked at the time of application, the overlapping areas of the material applied during the coating extrusion step form a good connection. The process parameters and corresponding pr...

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Abstract

The invention relates to a coating and to a method for coating exterior surfaces. The invention especially relates to a method for coating the exterior surfaces of pipes with a polymer that is cross-linked when exposed to water.

Description

technical field [0001] This invention relates to methods and coatings for coating exterior surfaces, and more particularly to a method of coating the exterior surfaces of pipes with polymers that are crosslinkable when exposed to water. The pipes according to the invention are hollow bodies suitable for transporting tangible media such as gases, liquids or solids. Background technique [0002] Steel pipes economically transport petroleum and petroleum products, gases, water, steam, solids and other media from the point of extraction or origin to the consumer around the world. Steel pipes must be corrosion-resistant to ensure long-term operational safety. For this purpose, pipes are usually treated with corrosion protection at the time of manufacture. The most common coating methods are: [0003] Coating 1 or 2 layers of FBE (Fusion Bonded Epoxy, fusion bonded epoxy resin); [0004] Epoxy resin, adhesive coating 3 layers, and non-crosslinked PE (polyethylene, polyethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/00F16L9/147C08J7/046
CPCB05D7/148F16L9/147B05D1/002B05D7/58Y10T428/1393B05D7/146
Inventor 海恩兹·沃格特彼得·约瑟夫·格隆斯菲尔德克劳斯·施米德
Owner BASELL POLYOLEFINE GMBH
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