Study On The Preparation And Mechanical Properties Of Micro-crystal Muscovite/PP/PA6 Composites

Polypropylene (PP) is a widely used universal plastic which hold regular structures, it is easy to crystallize, and the polymer spherulites make it cracks as well as low impact resistance, all defects limit its further application. Reinforcing and toughening is meaningful to PP .The paper is aimed at using micro-crystal muscovite and nylon6(PA6) to modify polypropylene. Microcrystal muscovite/PP, PP/PA6/PE-g-MAH, microcrystal muscovite/PP/PA6 / PE-g-MAH composites were prepared through melting blend method based on the modification of micro-crystal muscovite. The mechanical properties of the material was studied, and the toughening mechanism was discussed either. The main research contents and acquisition results in this paper was listed below:1 KH550 was used as a coupling agent to modify the surface of micro-crystal muscovite on the purposes of improving the interface properties between micro-crystal muscovite and PP. The results showed that there should be some chemical bonding when KH-550 was added about 0.9%.2 Microcrystal-muscovite/PP composite was prepared. The analysis of mechanical performance showed that the composite displayed a best comprehensive mechanical performance when micro-crystal muscovite was used about 10% to PP. The results followed as: The tensile strength was 36.94 MPa and the impact strength was 6.25 KJ/m2, which were increased 13% and 10% respectively than PP.3 The amount of compatibilizer PE-g-MAH was optimized through the tests of mechanical properties of PP/PA6 / PE-MAH composite which was about 4% to PP.4 The mechanical performance tests of micro-crystal muscovite/PP/PA6 / PE-g-MAH composite showed that the composite displayed a best comprehensive mechanical performance when micro-crystal muscovite and PE-g-MAH were used about 12% , 4% to PP respectively. The results followed as: The tensile strength was 40.1MPa and the impact strength was 8.46 KJ/m2 that was obviously better than PP, micro-crystal muscovite/PP as well as PP/PA6/PE-g-MAH.5 The toughened mechanism analysis of Polypropylene showed that after molten blend of micro-crystal muscovite, PP and PA6 , micro-crystal muscovite was dispersed in the matrix of PP. When impacts happened, the cavities and silver lines that caused by PP and PA6 could absorb energy which manifested as an enhancement of toughness. The interface deformation of PP/PA6 and micro-crystal muscovite/PP could buffer energy which showed an improvement of material strength.