Japanese Poly-Win and Dongli Industrial Co. have jointly developed a three-layer extruded tube, with an outer layer of 12 layers of polyamide and an inner layer of polyphenylene sulfide (PPS) resin, bonded together using a special adhesive. This tube material can withstand temperatures up to 130°C and exhibits low ionic elution into cooling water. Target applications include coolant lines for electric vehicles and industrial machinery.
PA12 is often combined with PP as the inner layer of automotive coolant lines, but this material is relatively weak in terms of continuous use and also suffers from hydrolysis. PPS resin solves these problems due to its excellent heat and hydrolysis resistance, but it cannot be directly combined with long-chain polyamides (such as PA12). Poly-Win and Dongli have developed a new material that solves this challenge, and this material can be bonded together using co-extrusion technology.
The new pipe structure offers higher thermal resistance and can replace metal pipes. Wave pipes are also a viable option. Additionally, the low ion elution makes this pipe material particularly suitable for electric vehicles and fuel cell vehicles.
Dongli is a leading global supplier of polysulfone resins. Poly-Win is actively developing the market for PA 12-PP pipe systems for automotive applications, and currently, through collaboration with Dongli, a new product portfolio of high-temperature pipe systems has been added.