Internal-pressure-resistant fiber weaving, winding and pultrusion composite pipe and preparation method thereof

Abstract

The invention relates to the technical field of pressure-resistant pipelines, in particular to an internal-pressure-resistant fiber weaving, winding and pultrusion composite pipe. The composite pipe sequentially comprises an anti-leakage layer, an annular winding layer and a fiber weaving layer from inside to outside in a composite mode, the anti-leakage layer is composed of anti-leakage fibers cured through gum dipping first thermosetting resin, and the annular winding layer and the fiber weaving layer are subjected to pressurized gum dipping by second thermosetting resin and are simultaneously cured with the first thermosetting resin to form an integrated structure. The invention further discloses a preparation method of the internal-pressure-resistant fiber weaving, winding and pultrusion composite pipe. The preparation method sequentially comprises the steps of inner layer preimpregnation, annular winding, outer layer weaving, secondary gum dipping and curing and pultrusion. According to the composite pipe and the preparation method thereof, through pressurized gum dipping of the second thermosetting resin, gaps among the anti-leakage layer, the annular winding layer and the fiber weaving layer and respective gaps are effectively filled, so that the three parts of a pipe body are cured into a whole.

Description

technical field [0001] The invention relates to the technical field of pressure-resistant pipes, more specifically, it relates to an anti-internal pressure fiber braided winding pultruded composite pipe and a preparation method thereof. Background technique [0002] Due to its excellent performance and designability, fiber reinforced thermosetting resin pipes have been widely used in various fields involving drainage, chemical industry, and cable pressure pipes. However, fiber-reinforced thermoplastic pipes are still in an immature era at this stage, with problems such as cumbersome production methods, high product prices, and low ring stiffness, and there is no substantial technological breakthrough in the field of large diameters. [0003] Most of the current market pressure pipes are made of thermoplastic materials, such as PE and PP. Most of the means to enhance the compression resistance are reinforced on the outer layer, such as steel mesh reinforced PE, fiber reinfor...

AI Technical Summary

Problems solved by technology

Most of the means to enhance the compression resistance are reinforced on the outer layer, such as steel mesh reinforced PE, fiber reinforced PP, etc. However, due to the low strength of thermoplastic materials, a certain working pressure must be met, and the product thickness must reach a certain size, thereby increasing production, transportation and storage. pressure

[0004] And currently there is no effective way to enhance the internal pressure resistance of pipelines. For example, the utility model patent with the application number CN201520121276.5 and the patent name "A Continuous Fiber Reinforced Thermosetting Resin Composite Pipe with Double-angle Winding Structure" only passes through multiple The adjustment of layer fiber winding angle strengthens the internal pressure of the pipeline, but it cannot substantially solve the problem of internal pressure resistance of the pipeline

[0005] Therefore, there are currently two main production methods for pipelines: 1. Production by winding method, which can increase the resistance to external pressure of the pipeline, but the production efficiency is low, the product price is high, and there is no high market value; 2. The production method of pultrusion, Production efficiency can be effectively guaranteed, but conventional materials and methods cannot meet the requirements of internal pressure resistance of pressure-resistant pipelines; third, the braided winding pultrusion method has a large number of micro-cracks inside, and the cracks are interpenetrated, causing the inside of the pipeline to withstand water When pressed, water will seep out along the crack

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