According to foreign media reports, LANXESS has developed a series of laser-weldable polyamides, PBT Durethan LT and Pocan LT (laser-transparent) materials. Recently, three new compounds have been added to the product range. Dr. Claudia Dahling, a specialist in process plastics at LANXESS, said: "These three new materials have good laser welding characteristics, and are safe to operate with excellent performance and a wide range of applications. Potential applications include electric vehicle drive and driver assistance system components, and IoT devices. "
High hydrolysis stability and excellent welding performance
Pocan B3233XHRLT (currently Pocan TP155-002) is a new 30% glass fiber reinforced PBT composite material that exhibits good laser transparency and is very resistant to corrosion in hot and humid environments.
At present, there are almost no such materials on the market, because standard hydrolysis-stabilizing additives usually lead to a significant reduction in laser transparency of PBT materials. The American Society of Automotive Engineers (SAE) has verified the excellent hydrolysis resistance of next-generation Pocan HR products through long-term testing. D? Hling said: "Our products have reached the 4-5 level in the USCAR test, which are the two highest levels."
Flame retardancy and laser transparency
Most flame retardants reduce the laser transparency of thermoplastics, so PBT, polyamide 6 and polyamide 66 compounds on the market rarely have good laser welding and high flame retardant properties at the same time. However, they are an essential raw material for battery system components for electric vehicles.
Dahling added: "We provide corresponding compounds based on polyamide 6, such as Durethan BKV30FN04LT. These materials have a halogen-free flame retardant package and pass the small sample thickness test of the UL 94 flammability test, reaching the highest classification of V-0. . "Can be processed safely in a stable process window, leaving almost no deposits on the tool. Moreover, the tracking resistance is up to 600 volts (IEC 60112 Comparative Tracking Index CTI A), making it an ideal component for high-voltage batteries and plugs.
Can be tailored to fit thicker walls
The third new LANXESS material that can be used for laser welding is Pocan TP150-002. This 30% glass fiber reinforced PBT compound is optimized for extremely high laser transparency. The transmittance reaches 13%, which is about twice that of most other laser-transparent PBT products (measured at 980 nm with an LPKF TMG-3 device, the sample thickness is 2 mm). D? Hling said: "We can tailor materials according to different designs to provide cost-effective laser-welded components to meet thicker wall requirements." LANXESS provides HiAnt services to customers to support the development of laser-welded components. Services include: (1) Use CAE tools to design components on the basis of materials. Dahling said: "We reduce distortion through simulation. For example, to make the connection process safer and more stable." (2) Perform extensive component testing services based on customer standards, such as performing dynamic tests on larger components, and Climate test required. (3) The service also includes technical support for injection molding, welding and sampling to start mass production.