PP/PE blends:
Although recycled PP has a higher mechanical strength and modulus than recycled PE, like the new PP resin, the impact resistance of recycled PP is particularly poor in stress crack resistance and poor in low temperature performance. These performance characteristics are determined by the aggregation structure of the PP and the macromolecular chain structure, and therefore can be modified with polyethylene. When recovering PE (LDPE, HDPE) and PP blends, if the recycled PP content is relatively high, the alloy can be directly prepared; if 10% to 25% HDPE is blended in PP, the modified blend is - At 20°C, the falling ball impact strength is more than 8 times higher than that of PP, and the processing fluidity is increased, which can be applied to the injection molding of large containers. Structurally speaking, the addition of PE destroys the crystallization of PP, such as spherulites, and also reduces the crystallinity of PP; if additional EPDM is added to the system. (About 5%), can improve the compatibility of PP and PE, the strength is improved; adding a small amount of EPR rubber can also improve the impact properties of the material.
PP/PVC blends:
For PP recycled materials containing PVC, some CPE compatibilizers may be added to improve the properties of the blends. Recycled PP can be used to improve the molding fluidity of PVC products. If the PVC:PP:EPDM:CPE is 100:10:20:20, the impact strength of the alloy can be maximized. For PE, PP, PVC ternary blends, in addition to adding the compatibility agent CPE, EPR, the reaction extrusion technology can also be used to prepare alloys. For example, the grafting reaction is performed with maleic anhydride or maleate to compatibilize. In this method, plasticizing, grafting, and blending are performed in a screw extruder, which can be completed in one operation. The length and diameter ratio of the screw of the screw extruder is required to be about 40, and there are exhaust and feed ports in the middle, and the screw extruder. It can be a single screw extruder or a twin screw extruder.
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