Prepn process of outer anticorrosive coating for steel pipe

Abstract

The present invention is the preparation process of outer anticorrosive coating for steel pipe. In the mechanized production line comprising pipe feeding machine, pre-heating machine, shot peeling machine, material mixing machine, spraying machine, glue extruding and painting machine, winding machine and stoving machine, outer anticorrosive coating with resin mortar layer and high strength net layer may be formed through the steps of steel pipe locating and conveying, derusting and decontaminating, painting primer, stoving primer, painting resin mortar, winding reinforcing net, winding protecting layer, curing the anticorrosive coating, etc. The outer anticorrosive coating has high mechanical strength, high anticorrosive performance, stable quality, simple operation and other advantages. The present invention may be used in anticorrosion of various kinds of steel pipe.

Description

Technical field [0001] The invention relates to the technical field of anticorrosion of steel pipelines, in particular to a preparation method of an outer anticorrosion coating of steel pipelines. Background technique [0002] At present, the materials used for the external anti-corrosion coating of steel pipelines generally include the following five types: polyethylene coating coating, fusion bonded epoxy coating, epoxy coal tar pitch coating, petroleum bitumen coating, polyethylene tape coating coating Layer, between the coatings is wound glass fiber cloth as the strength layer, according to the anti-corrosion grade, it can be wound multi-layer, and the preparation method is generally to use manual winding and brushing on the steel pipe on site, or put the anti-corrosion coating The anti-corrosion tape is wound on the steel pipe. This kind of manual on-site operation construction has a long production cycle, high labor intensity, harsh construction environment, and poor q...

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Problems solved by technology

[0002] At present, the materials used for the external anti-corrosion coating of steel pipelines generally include the following five types: polyethylene coating coating, fusion bonded epoxy coating, epoxy coal tar pitch coating, petroleum bitumen coating, polyethylene tape coating coating Layer, between the coatings is wound glass fiber cloth as the strength layer, according to the anti-corrosion grade, it can be wound multi-layer, and the preparation method is generally to use manual winding and brushing on the steel pipe on site, or put the anti-corrosion coating The anti-corrosion tape is wound on the steel pipe. This kind of manual on-site operation construction has a long production cycle, high labor intensity, harsh construction environment, and poor quality control. In order to solve this problem, the inventor invented a mechanized preparation of pipeline anti-corrosion coating. The preparation method of the layer, and applied for a patent, the patent number is: ZL00134140.5; the patent name is: a preparation method of anti-corrosion pipeline; this patent solves a series of problems caused by the above-mentioned on-site manual operation construction, and realizes mechanized continuous production Preparation of anti-corrosion coatings for pipelines, but the anti-corrosion coatings prepared by the above-mentioned anti-corrosion materials have a common disadvantage that the mechanical strength of the coating is low, especially when anti-corrosion steel pipes are used in submarine pipelines, or in rivers, roads, and railways. When used on pipelines, damage is often caused by collisions, which bury hidden dangers of corrosion for pipelines. Further solving this problem is an urgent problem to be solved in this technical field.

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