Method for preparing glass fiber reinforced plastic protective layer on polyethylene anti-corrosive layer of steel pipe

Abstract

The invention provides a method for preparing a glass fiber reinforced plastic protective layer on a polyethylene anti-corrosive layer of a steel pipe. The method comprises the following steps of 1, input of parameters; 2, delivery and mixing of epoxy resin and a solvent; 3, soaking of glass fiber reinforced plastic fabric; 4, surface treatment of the anti-corrosive steel pipe before winding; 5, automatic winding of the glass fiber reinforced plastic fabric; 6, thermal curing of the glass fiber reinforced plastic fabric in a winding area; 7, cleaning of a mixer and a mixing pipeline; and 8, polishing, detection and stacking of finished products. According to the method, the mixer, a sealed and pressurized glue dipping trough, and other equipment are adopted, the polyethylene anti-corrosivelayer of the steel pipe is wrapped with the glass fiber reinforced plastic fabric when a movable trolley and turning wheels rotate and move in the steel pipe, and subsequent treatment and curing areconducted, so that automatic winding and rapid curing of the glass fiber reinforced plastic fabric are realized, the labor intensity is greatly reduced when the glass fiber reinforced plastic protective layer is wound, and the winding efficiency of the glass fiber reinforced plastic protective layer is improved.

Description

technical field [0001] The invention relates to the field of steel pipe surface anticorrosion and preparation of a protective layer, in particular to a method for preparing a glass fiber reinforced plastic protective layer on a steel pipe polyethylene anticorrosion layer. Background technique [0002] The common anti-corrosion coating currently used on oil pipelines and gas pipelines is generally two to three layers of polyethylene anti-corrosion coating (3LPE). When the anti-corrosion steel pipe coated with anti-corrosion layer passes through areas with harsh environments such as mountains and rivers, it is very easy to cause large-scale damage to the anti-corrosion layer coated on the outside of oil pipelines and gas pipelines, resulting in weakened or invalid anti-corrosion functions of steel pipes. The insulation resistivity and other properties of the layer drop sharply, which makes the maintenance cost of crossing the steel pipe high and difficult. Ordinary anti-corro...

AI Technical Summary

Problems solved by technology

However, in the prior art, at the pipeline laying site, the construction of polyethylene (LPE) anti-corrosion pipes and glass fiber reinforced plastics are all made of manual pasting, and the workmanship is rough, the process conditions are poor, the construction environment is also very bad, the molding time is long, and the efficiency is low. , it is difficult to form a continuous dense structural layer

The reasons for this phenomenon are as follows: First, the number of glass fiber cloth is high. When using FRP resin coating, the wettability is poor. The formed FRP protective layer is prone to fiber exposure and interlayer detachment. The glass fiber is easy to break. The number of glass fiber cloth actually used is lower than the standard requirement; when the glass fiber cloth is hooped or cross-wound, it is difficult to achieve uniform thickness by manual winding, especially for large-diameter steel pipes above 813mm, and the construction difficulty increases

The second is that the proportion and viscosity of the coating resin of FRP should be adjusted according to the change of the ambient temperature on site. The coating quality and construction progress of the outer protective FRP

The article does not describe the environmental protection control measures when applying adhesives on PE pipes

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