Aluminum plastic laminated tube and method for producing the same

Abstract

The invention relates to the field of pipes, in particular to an aluminum-plastic composite pipe and a manufacturing method thereof. The aluminum-plastic pipe comprises inner polyethylene, hot melt adhesive, an aluminum pipe, hot melt adhesive and outer polyethylene sequentially from inside to outside, and is characterized in that the outer polyethylene is mediate-density polyethylene with a specific gravity more than 0.93g / m<3> and less than 0.95g / m<3>. Due to a special structure with a polyethylene main chain and an octylene short branch chain of the adopted outer mediate-density polyethylene, the aluminum-plastic pipe has excellent flexibility, tensile and cracking resistance, lower temperature and shock resistance, excellent long-term pressure resistance and thermal creep resistance of the octylene. The composite pipe having a creep damage curve meeting product standards is the only variety of polyethylene that can be used as a hot water pipe without cross bonding at present, and can be widely used in the fields of floor heating, potable water pipe systems, hot water supply systems, and the like.

Description

technical field [0001] The invention relates to the field of pipe materials, in particular to an aluminum-plastic composite pipe and a manufacturing method thereof. Background technique [0002] Aluminum-plastic composite pipe is a new type of pipe developed abroad in the 1980s. It is a five-layer composite pipe that combines polyethylene, polyethylene-specific hot melt adhesive, and aluminum alloy foil through high-temperature and high-pressure extrusion molding. The outermost layer and the inner layer are high-density polyethylene (specific gravity greater than 0.95g / m 3 ), the second layer is hot melt adhesive, the third layer is aluminum tube, and the fourth layer is also a layer of hot melt adhesive. The outer material must be the same. The inner and outer layers of aluminum-plastic composite pipes currently produced are usually made of high-density polyethylene. Because high-density polyethylene contains more double bonds, and the hydrogen atoms on the α carbon atoms...

AI Technical Summary

Problems solved by technology

The inner and outer layers of aluminum-plastic composite pipes currently produced are usually made of high-density polyethylene. Because high-density polyethylene contains more double bonds, and the hydrogen atoms on the α carbon atoms next to the double bonds are easier to absorb than the hydrogen atoms on the tertiary carbon atoms. Oxidation, so the aging resistance of high-density polyethylene is poor, and the aging speed is faster under high temperature and high pressure, and the intermolecular force of high-density polyethylene is small, so the macromolecular chains are easier to slide each other. Stressed polyethylene can still undergo slow deformation

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