Test methods for PP granulator

Due to its high shrinkage rate, universal PP often leads to product defects, such as poor dimensional stability, easy warping and deformation, and its poor toughness makes its low-temperature brittleness particularly prominent. In order to expand the application field of PP, it is necessary to conduct modification experiments and strive to find methods to improve its performance. Experimental Ethylene Octene Copolymer - Polyolefin Elastomer (POE) and β Nucleating agents are toughening agents, using environmentally friendly color mixed inorganic pigments with high temperature resistance and excellent light and weather resistance as colorants. New magnesium salt whiskers are used as stiffening agents, supplemented by functional additives such as antioxidants and ultraviolet absorbers, to study the mechanical properties of the blend system.

1. Preparation of process functional masterbatch: In this experiment, the carrier PP resin, magnesium salt whiskers activated by silane coupling agent, weather resistance improver, antioxidant β Crystalline nucleating agents, dispersants, and other additives are accurately weighed according to a certain ratio. After being mixed at high speed and fully mixed, they are extruded and fed by a twin screw extruder. The extruded products of the mixer are hot cut and granulated by an air-cooled mold surface to produce a high concentration multifunctional masterbatch for backup.

2. Preparation of dynamic vulcanization masterbatch: Using a two-step cross-linking process, POE, cross-linking agent, a small amount of PP, light resistant, high temperature resistant and environmentally friendly inorganic coloring pigments, and dispersants are blended and extruded in a certain proportion through a twin screw extruder, and then water cooled and pelletized to form a dynamic vulcanization masterbatch for later use; 3. Sample preparation: Accurately weigh two types of PP resins, multi-functional masterbatches, and dynamic vulcanization masterbatches in a certain ratio, mix them thoroughly in a high-speed mixer, and then extrude them through a twin screw extruder. The extruded products are first cooled in a water bath, then granulated using a granulator. The dried materials are then injected into the injection molding machine for sample preparation, and then impacted onto the standard sample.