Manufacturing method of fiber reinforced polyethylene composite double-layered tube

Abstract

A method for manufacturing a fiber-reinforced polyethylene composite material double-layer pipe, comprising the following steps: (1) cutting carbon fibers or glass fibers into short fibers of 5mm-9mm; (2) mixing the cut short fibers with uniformly mixed polyethylene The ethylene powder and the antioxidant are fully mixed and extruded through a twin-screw extruder to obtain fiber-reinforced polyethylene pellets; (3) using a multi-layer co-extrusion process, the polyethylene and the fiber reinforced in step (2) Double-layer co-extrusion of polyethylene pellets, the two layers are bonded by hot melt, and after cooling, a fiber-reinforced polyethylene composite material double-layer pipe is formed.

Description

technical field [0001] The invention provides a fiber-reinforced polyethylene composite double-layer pipe. Specifically, using a multi-layer co-extrusion process, polyethylene and short-cut fiber-reinforced polyethylene pellets are double-layer co-extruded to obtain a fiber-reinforced polyethylene composite double-layer pipe, and the outer layer of the pipe wall is chopped fiber-reinforced polyethylene Vinyl layer, the inner side of the pipe wall is a polyethylene layer. Background technique [0002] The usual polyethylene pipe material uses PE100. Under the condition of the maximum allowable pressure of 1MPa, the ratio (SDR) of the outer diameter of the pipe to the wall thickness of the pipe is specified as 11. At present, PE100 pipe is the polyethylene material with the highest practical specification. Due to the characteristics of shock resistance, flexibility and corrosion resistance of PE pipe, it is widely used in buried water pipes. The polyethylene material has exc...

AI Technical Summary

Problems solved by technology

[0005] CN102408610A only discloses reinforced polyethylene pipe products, but does not disclose its preparation method, and what CN102408610A discloses is the overall reinforcement method of directly extruding pipes after mixing polyethylene with fibers and additives, and CN102408610A cannot realize specific Use requirements, adjust the thickness ratio of reinforcement layer / fiber reinforcement layer, which cannot be achieved by directly extruding pipes after mixing fibers with polyethylene

In this invention, there is no adhesive between the metal layer and the polyethylene layer in the middle, and it is simply physically superimposed and covered. From the cut surface of the composite pipe, the polyethylene layer and the metal layer can be peeled off, and the entire composite pipe has an integrated structure. Performance will be affected. For example, the excellent tensile properties of polyethylene materials during earthquake resistance will be restricted by the outer metal layer, which will reduce the seismic performance of the overall pipe; at the same time, the invention requires metal The layer is extremely thin, which brings high technical requirements to the processing, and the carbon fiber reinforced part added to the metal outer layer, due to the use of carbon fiber cloth or resin-impregnated continuous fibers (carbon fiber or glass fiber), the process is more complicated. Production higher cost