STUDY ON DYNAMICALLY VULCANIZED PP/EPDM BLENDS USING PREDISPERSED ADDITIVES FOR BLOW MOLDED EXTRUDED PRODUCTS

摘要

Thermoplastic vulcanisates (TPV) prepared from rubber -plastic blends by dynamic vulcanization route have gained considerable importance in recent years due to its dual characteristics of elastomers and thermoplastics. The present study is aimed at the development of PP/EPDM based TPVs with various elastomer bound chemicals. The elastomer phase of EPDM/PP based TPV were dynamically cured by using different vulcanizing agents alone and with different combinations for e.g. sulfur-accelerator and alkyl-phenol-formaldehyde resin(SP-1045), SP-1045 and predispersed resin(Multisperse XP-1045-45). The properties of blends are studied by determining MFI value, tensile strength, tension set & compression set. Adding SP-1045 resin alongwith predispersed resin (alkyl-phenol-formaldehyde resin in elastomer binder) in PP-EPDM based TPVs showed better tensile properties & lower compression & tension set values. The processability characteristics of all the blends during extrusion is also observed. Among all curatives, best optimum properties together with good processability are observed with a mixed curative system namely resin (SP-1045)and predispersed resin (Multisperse XP-1045-45).