Mineral filled low-shrinkage modified polypropylene composite material and preparation method thereof
A low shrinkage, composite material technology, applied in the field of modified polypropylene composite materials, can solve the problems of affecting the shrinkage rate, destroying the crystallinity of polypropylene, and reducing the apparent quality of polypropylene materials.
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[0037] Mix the weighed polypropylene, polyethylene and elastomer at high speed for 5 minutes at 1000-2000 rpm; then add mineral fillers and mix at high speed for 5 minutes at 1000-2000 rpm; then add compatibilizer and Auxiliary, mix at high speed for 3 minutes at 1000-2000 rpm to obtain premix. Feed the premixed material into the twin-screw extruder, preheat for 3-5 minutes, wherein the temperature of each zone of the screw is 190-250 ° C, the screw speed is 200-500 rpm, extrude and granulate, and the product can be produced Modified polypropylene composites with low shrinkage.
[0038] The group allocation ratio of each embodiment is shown in Table 1.
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