Three-layer composite pipe and preparation method thereof

Abstract

The present invention discloses a three-layer composite pipe, including an inner layer, a middle layer, and an outer layer, where raw materials of the outer layer, in percentage by mass, includes: 50-95% of high-viscosity low-melting-point polyamide resin, 4.5-30% of a toughener, 0-20% of a plasticizer, 0.1-2% of a chain extender, and 0.1-1% of a heat-resistant agent; raw materials of the inner layer, in percentage by mass, includes: 40-90% of high-viscosity block copolymer polypropylene, 5-40% of high-viscosity homopolymer polypropylene, and 0-20% of a toughener; and the middle layer is an adhesive layer. The present invention further discloses a method for preparing the three-layer composite pipe. The three-layer composite pipe of the present invention can be used for straight pipes and corrugated pipes, having excellent mechanical properties, low-temperature toughness, and thermal aging resistance, good formability, and ease of shaping. It is suitable for cooling pipeline systems such as new energy vehicle batteries and energy storage batteries.

Dependencies are inferred from the claim text.