Discussion on PA and PBT Alloys

PA6 has excellent mechanical properties, good wear resistance and self-lubricity, and is easy to form and process. It is a widely used engineering plastic. However, PA6 has the shortcomings of large moisture absorption, unstable size, and large molding shrinkage. Polybutylene terephthalate (PBT) has the advantages of good stiffness, high strength, excellent heat aging resistance, good resistance to organic solvents, easy processing and forming, etc., but also has poor impact toughness, and it is resistant to high temperature and high humidity. Disadvantages such as easy decomposition under the environment. The two alloys can improve the water absorption of PA6 and the impact brittleness of PBT. The blending compatibility of PBT and PA6 is poor. The most effective way to solve this problem is to add a compatibilizer to form a copolymer at the polymer interface to have a compatibilizing effect and reduce the interfacial tension, so that the performance of the polymer can be obtained. improve.