Application of hyperbranched polyester in PA6 (polyamide 6)

Abstract

The invention relates to a hyperbranched polyester, particularly application of a hyperbranched polyester in PA6 (polyamide 6). The application comprises the following steps: (1) drying hydroxyl-terminated hyperbranched polyester; (2) drying pure PA6; (3) uniformly mixing the hydroxyl-terminated hyperbranched polyester obtained in the step (1) with the pure PA6 obtained in the step (2); and (4) granulating the uniformly mixed hydroxyl-terminated hyperbranched polyester and pure PA6 obtained in the step (3) by using a double screw extruder, and drying to obtain the modified PA6 product. The application can obviously lower the melt viscosity of PA6 and improve the physical properties.

Description

Technical field

[0001] The invention relates to a hyperbranched polyester, in particular to the application of a hyperbranched polyester in PA6. Background technique

[0002] PA6 has good chemical, mechanical and heat resistance properties and is recognized as the most cost-effective engineering plastic. It is widely used in electronics, consumer products and engineering components. However, the high water absorption rate is caused by the polarity of the amide group in the PA6 molecule, which will cause poor dimensional stability, lower product modulus and yield stress, and lower rigidity at low temperatures. Etc., thus limiting the possible application areas of PA6. In addition, during the melt processing of PA6, thermal degradation occurs at temperatures exceeding 260°C, which will affect the performance of the product. The modification of PA6 has been carried out by blending, copolymerizing, filling fillers or reinforcing fibers, etc., to produce a stronger and stricter mat...