Ultrahigh molecular-weight polyethylene composite tubing and production method thereof

Abstract

The invention discloses an ultrahigh molecular-weight polyethylene composite tubing and a production method thereof. The tubing is of five-layer composite structure, a core layer (1) is formed by winding drawn and oriented sheets, an adhesive layer (2) and a vulcanized rubber layer (3) are coated on the outer surface of the core layer, a helically wound reinforced fiber layer (4) is wrapped outside the vulcanized rubber layer, and the outermost layer is an HDPE (high-density polyethylene) layer (5). The production method includes: firstly, drawing and orienting ultrahigh molecular-weight polyethylene to form sheets; secondly, winding the sheets of the first step to form the core layer, winding a circular tube by drafted and oriented ultrahigh molecular-weight polyethylene sheets, welding adjacent tubing seams to form a continuous core tube; thirdly, coating adhesives on the outer surface of the core layer; fourthly, winding the vulcanized rubber layer on the surface of the adhesive layer formed in the third step; fifthly, winding a fiber belt on the surface of the vulcanized rubber layer; sixthly, wrapping an HDPE melt layer on the outer surface of the fiber belt to form a composite tubing; and seventhly, vulcanizing the composite tubing formed in the sixth step.

Description

technical field [0001] The invention belongs to the technical field of high-performance composite pipes, in particular to an ultra-high molecular weight polyethylene composite pipe and a production method thereof. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with a linear structure and excellent comprehensive properties. Corrosion, non-toxic and environmentally friendly, not easy to absorb water, low density and other properties, it is known as "amazing plastic" at home and abroad. The excellent physical and mechanical properties of UHMWPE make UHMWPE pipes widely used in various fields of the national economy, especially as engineering pipes for conveying particles, powder materials, slurries, and solid-liquid mixtures. The application fields are extremely broad. [0003] There is a long coastline in the east of my country. It is more difficult to dredge the bay than the river. Coral reefs, pebbles, ...

AI Technical Summary

Problems solved by technology

However, UHMWPE has low tensile strength, poor creep resistance and poor cutting resistance.

Simple ultra-high molecular weight polyethylene pipes have low compressive strength, are prone to creep, and have poor resistance to natural damage, so they cannot be used as pipelines for the above materials

In addition, due to the low critical shear rate of ultra-high molecular weight polyethylene, melt fracture is prone to occur during the extrusion process, processing is very difficult, the production rate is extremely slow, and the production cost is high, which seriously affects the application field and market promotion of the material.

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