Study On Surface Treatment Of Inorganic Fillers And Polyolefin Composites

The study based on composite blend system of different particle size of calcium carbonate,talc and coupling agents and HDPE.The research was divided in to three parts. (1) The surface modification of inorganic fillers with titanate coupling agent;(2) the interface modifier preparation;(3) co-composite modification study on modified powder and HDPE matrix resin.In the surface modification,the talc and different particular size calcium carbonate (CC8,CC28,CC60) were modified by TM-S.And the content of TM-S,modified temperature,time and other parameters were investigated.In the interface modifier preparation,gafting of maleic anhydride onto POE was performed by co rotating twin-screw extruder in the presence of DCP used as a free radical initiator.The influences of monomer,initiator content on the grafting degree were studied. The result showed that the best grafting degree was obtained when DCP/MAH ratio was 0.15%/2%,and the grafting degree was 0.73%.In the study of co-composite of modification and HDPE matrix resin,the effect of titanate coupling agent,inorganic rigid particle size distribution,CaCO₃ gradation(CC8,CC28,CC60)and the co-composite CaCO₃/talc were investigated.The results showed that the stiffness of composites were improved with increasing of talc and the toughness of composites was enhanced with increasing of CaCO₃,when minimum grain size CaCO₃ (CC60) was used.With the interface modifier(POE-g-MAH) were added into the HDPE/TT/CC60 composites,the toughness were greatly increased.The crystallization behavior and the micro-morphology of a series of composites were characterized by(DSC) differential scanning calorimetry and(SEM) Scanning electron microscopy.