Composition and method of manufacture of multi-layer tube having polyamide outer layer

Abstract

The present disclosure provides a multilayer pipe comprising an outer layer of polyamide, an intermediate layer of polyolefin, and an inner layer of thermoplastic elastomer. The outer polyamide layer provides sufficient mechanical strength, and the middle polyolefin layer protects polyamide from being in contact with water so as to avoid hydrolytic degradation. The thermoplastic elastomer inner layer can prevent stress cracking of the polyolefin intermediate layer and provide excellent sealing for the connection.

Description

technical field [0001] The present disclosure relates to a tube for use in a motor vehicle. More specifically, the present disclosure relates to a multilayer tube that can be used to transport fluids for temperature control in motor vehicles. Background technique [0002] Single-layer and multi-layer pipes of synthetic materials such as plastics and elastomers have been proposed for coolant lines. Coolant lines for electric and motor vehicles are in ever-growing demand. The cooling systems of electric vehicles and motor vehicles with internal combustion engines are similar. Both circulate coolant through a series of heat exchange tubes to transfer heat away from the engine. [0003] The medium temperature coolant system operates at a continuous temperature of about 90°C to about 120°C, with a peak temperature of about 5°C to about 10°C higher than the continuous temperature. It is important that the coolant tubes are constructed of a material that prevents coolant from s...

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Problems solved by technology

The hydrolysis that then occurs reduces its burst strength, which can lead to pipe failure or leaks at connections

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