Expanded graphite modified injection molding grade ultra-high molecular weight polyethylene and preparation method thereof
A technology of ultra-high molecular weight and expanded graphite, which is applied in the field of modified ultra-high molecular weight polyethylene, which can solve the problem of large decline in impact strength and wear resistance of ultra-high molecular weight polyethylene composite materials, unfavorable extrusion of composite materials, and expensive LCP and other issues, to achieve the effects of easy injection molding, improved energy transmission, and low cost
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Embodiment 1
[0016] Add 90kg ultra-high molecular weight polyethylene (viscosity average molecular weight 2 million), 10kg high-density polyethylene (2208J), 3kg expanded graphite (200 times volume expansion) Mixed at 40 rpm for 10 minutes, then crushed with a crusher, and finally extruded and granulated by a twin-screw extruder to obtain an injection-molded ultra-high molecular weight polyethylene composite material modified by expanded graphite. The temperature of the screw is 160° C., and the rotational speed of the screw is 80 rpm. The melt index of the obtained ultra-high molecular weight polyethylene blended modified product is 1.2g / 10min, the tensile strength is 28MPa, and the Charpy notched impact strength is 83kJ / m 2 , The coefficient of friction is 0.15.
Embodiment 2
[0018] Add 90kg of ultra-high molecular weight polyethylene (viscosity average molecular weight 3 million), 10kg of high-density polyethylene (2208J), and 5kg of expanded graphite (300 times the volume expansion multiple) into the rubber-plastic internal mixer. Mixed at 50 rpm for 10 minutes, then crushed with a crusher, and finally extruded and granulated by a twin-screw extruder to obtain an injection-molding grade ultra-high molecular weight polyethylene composite material modified by expanded graphite. The temperature of the screw is 180° C., and the rotational speed of the screw is 120 rpm. The melt index of the obtained ultra-high molecular weight polyethylene blended modified product is 1.5g / 10min, the tensile strength is 27MPa, and the Charpy notched impact strength is 81kJ / m 2 , The coefficient of friction is 0.12.
Embodiment 3
[0020] Add 80kg of ultra-high molecular weight polyethylene (viscosity average molecular weight 3 million), 20kg of high-density polyethylene (1300J), 3kg of expanded graphite (200 times of volume expansion) Mixed at 60 rpm for 10 minutes, then crushed with a crusher, and finally extruded and granulated by a twin-screw extruder to obtain an injection-molded ultra-high molecular weight polyethylene composite material modified by expanded graphite. The temperature of the screw is 220° C., and the rotational speed of the screw is 200 rpm. The melt index of the obtained ultra-high molecular weight polyethylene blended modified product is 2.2g / 10min, the tensile strength is 28MPa, and the Charpy notched impact strength is 75kJ / m 2 , The coefficient of friction is 0.18.
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