废旧胶粉/聚丙烯共混物的制备及性能研究

熔融接枝法制得的马来酸酐接枝聚丙烯5076(MAH-g-5076)可改善聚丙烯与废旧胶粉的界面相容性,高熔体质量流动速率聚丙烯MF650Y可改善废旧胶粉/聚丙烯共混物的流动性能,利用双螺杆挤出机挤出制得高性能、易加工的废旧胶粉/聚丙烯共混物,研究MF650Y用量对共混物性能的影响。结果表明:随着MF650Y用量(MF650Y和MAH-g-5076用量共30份)的增大,共混物的拉伸强度先增大后减小,在MF650Y用量为5~10份范围内达到最大值,拉断伸长率呈现震荡减小趋势,熔体质量流动速率增大;随着角频率的增大,共混物的复数粘度(η*)减小,储能模量(G′)和损耗模量趋于增大,当MF650Y用量为5份时,共混物的η*和G′最大;MF650Y用量为10份时有助于保护C=C键及抑制交联反应,此时聚丙烯与废旧胶粉相容性较好,两相界面结合能力较强,共混物无明显孔洞。

Preparation and Properties of Waste Rubber Powder/Polypropylene Blends

The maleic anhydride grafted polypropylene 5076(MAH-g-5076) which was prepared by melt grafting method could improve the interface compatibility between polypropylene and waste rubber powder,and polypropylene MF650 Y which had a high melt mass flow rate could improve the flow properties of waste rubber powder/polypropylene blends. In this study,waste rubber powder/polypropylene blends with high-performance and good processing properties were prepared by twin-screw extruder extrusion,and the effect of the addition level of MF650 Y on the properties of the blends was studied. The result showed that with the increase of the addition level of MF650 Y(total addition level of MF650 Y and MAH-g-5076 was 30 phr),the tensile strength of the blends increased first and then decreased,it reached the maximum value when the addition level of MF650 Y was 5 ~ 10 phr,the elongation at break presented an oscillating decreasing trend,and the melt mass flow rate increased. As the angular frequency increased,the complex viscosity(η*) of the blends decreased,and the storage modulus(G′) and loss modulus tended to increase. When the addition level of MF650Y was 5 phr,the η* and G′ of the blends were the largest. When the addition level of MF650 Y was 10 phr,it effectively helped to protect the carbon-carbon double bond and inhibited the cross-linking reaction. At this time,the compatibility of polypropylene and waste rubber powder was better,the bonding ability of the two-phase interface was stronger,and there was no obvious hole in the blends.