Double-layer composite pipe and its preparation method

Abstract

The invention discloses a double-layer composite tube and a manufacturing method thereof. The double-layer composite tube and the manufacturing method aim to solve the technical problems that black pigment is added into traditional HDPE tubes, accordingly inner walls are not smooth, water scale is prone to being generated, bacteria grow, and secondary pollution of water is caused. The double-layer composite tube comprises an inner layer and an outer layer, the inner layer is made of ultrahigh molecular weight polyethylene and ethylene-vinyl alcohol copolymers or low-density polyethylene, and the outer layer is made of high-density polyethylene, ethylene-vinyl alcohol copolymers and special melanin particles C of PE. The method includes the following steps of material proportioning and dehumidifying, material plastifying, material forming, vacuum sizing and spraying and cooling. The double-layer composite tube has the advantages of being good in toughness and flexibility, high in chemical stability, good in corrosion resistance, good in sealing performance, large in distribution power, long in service life, high in low temperature resistance, hygienic, free of toxin and the like. The manufacturing method is simple, easy to operate and capable of achieving integral production of the double-layer composite tube.

Description

technical field

[0001] The invention relates to the technical field of HDPE pipe material production for water supply engineering, in particular to a double-layer composite pipe material and a preparation method thereof. Background technique

[0002] HDPE-100 grade pipe has strong toughness, durability and good fission resistance. It has been widely used in urban and rural safe drinking water projects for people and animals. However, due to the poor UV resistance of HDPE itself, it needs to be used in use Add a certain proportion of carbon black parent material (0.2g%-0.5g%) to enhance the decomposition power of anti-ultraviolet rays, and achieve the effect of prolonging the service life of the pipe and improving the compressive ability. Since the carbon black element is in the form of micro-molecular particles, some fine cracks and surface fine particles will be formed on the surface when it is heated and cooled, which will be deposited on the inner layer of the pipe, makin...

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