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High shear resistant pipewrap anti-corrosion system
| Details |
Inventors: Jenkins, Robert F.;
Assignee: The Kendall Company (Boston, MA)
Primary Examiner: Gallagher; John J.
Assistant Examiner:
Attorney, Agent or Firm: Cantor; Frederick R.
An anticorrosion and high shear resistant pipewrap system is described wherein a pipe surface is first coated with a primer comprised of natural rubber, resins, and a metal oxide activator dispersed in an organic solvent. The primer-coated pipe is then overlaid with an adhesive-coated polyolefin tape, the adhesive comprising a butyl-based rubber, tackifying agent and a cross-linking agent, p-quinone dioxime. The cross linking agent functions in the presence of an organo-titanate-treated metal oxide, being a catalyst such as lead dioxide, or the like, that results in high rates of cross linking in both the primer coating, the adhesive coating and the primer/adhesive interface zone. Minimal creep of the described anti-corrosion protective coating is noted in high shear stress environments. |
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DETAILED DESCRIPTION An object of the present invention is to provide an improved anti-corrosion protective coating for the surface of metal pipes that are designed for inground implantation.
Another object of the instant invention is to provide a multi-component, helically-wrapped, anti-corrosion protective coating for the surface of metal pipes that are to be subjected to a high shear stress inground environment.
A typical conventional pipewrap anti-corrosion protective system may comprise a primer that is applied to the pipeline outer surface, and an anti-corrosion protective adhesive tape overlaying the primer coating.
The primer in the conventional pipewrap anti-corrosion system is typically a mixture of rubber and resins, which may be applied to the pipeline outer surface, by means of spraying, brushing, dipping or rugging.
The adhesive tape is generally composed of a polyolefin backing material, such as polyethylene, or the like, with a rubber-based adhesive that is coated onto a surface of the polyolefin backing material.
In the conventional pipewrap anti-corrosion protective system there is no crosslinking agent present in either the primer or the adhesive tape components.
The present invention, in contradistinction, comprises a two component interacting pipewrap anti-corrosion protection system, one component being a primer, preferably a mixture of solvent, natural rubber and resins.
The present invention primer is preferably utilized with the incorporation of a crosslinking activator, in this invention, an organo-titanate-treated metal oxide.
The adhesive-coated polyolefin backing material may be a polyethylene material, or the like.
The adhesive coating is a butyl-based rubber mixture applied to one surface of the polyethylene, or the like, backing material by conventional processes, and is a partially crosslinked material.
The partial crosslinking of the adhesive coated onto the polyolefin tape backing material, is effected by means of both heat and the crosslinking agent, p-quinone dioxime
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