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As we all know, patch is more and more widely used in pipeline cathodic protection. Repair patch is a kind of radiation crosslinked polyethylene anti-corrosion coating material, which is mainly designed for the welding seam anti-corrosion repair of buried pipeline or overhead steel pipeline and the heat preservation repair resistance of thermal insulation pipeline. It is composed of special sealing hot melt adhesive coating and radiation crosslinking polyolefin substrate. The special sealing hot melt adhesive can form good adhesion with polyethylene substrate, steel pipe surface and solid epoxy coating. The patch can heat and melt the adhesive layer, paste the damaged pipeline surface, and form a close and continuous anti-corrosion system with the original pipeline anti-corrosion coating, which can resist soil stress corrosion, hydrostatic pressure, cathodic stripping, chemical corrosion and other corrosion behaviors.
At present, there are two kinds of patch widely used in the market, one is ak-1100 reinforced fiber patch, the other is ak-1200 polyethylene patch. Ak-1100 reinforced fiber patch is a kind of high-strength polypropylene fiber fabric as the base material, coated with a high viscosity rubber modified asphalt, after special processing. It has excellent tensile strength and strong adhesion performance, which can effectively resist soil stress, impact of external force and thermal expansion, prevent deformation and peeling of anti-corrosion coating, greatly extend the anti-corrosion life, and its non-aging characteristics can make the anti-corrosion life reach more than 40 years. Ak-1100 reinforced fiber patch is used to repair and repair buried steel pipeline, oil storage tank and old pipeline, as well as anticorrosion of pipeline interface.
After understanding the first patch, we are going to talk about the second ak-1200 polyethylene patch, which is made by coating a layer of rubber modified asphalt on the surface of polyethylene sheet, and its design principle is mainly to meet the requirements of geological humid area and small orifice pipe diameter anti-corrosion, with good toughness and tensile strength, and with moisture resistance, heat expansion resistance and resistance to moisture Wear characteristics. Ak-1200 polyethylene patch is mainly used for the maintenance and repair of long-distance buried steel pipelines, oil storage tanks and old pipelines, as well as the anti-corrosion of pipeline interfaces.