Polypropylene material and its preparation method, structural part and its preparation method
A polypropylene material and a production method technology, applied in the field of vibration friction welding, can solve the problems of reduced weld strength and strength retention rate, increased material density, and increased molecular chain orientation.
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[0041] Further, the present invention also provides a preparation method of the polypropylene material of any of the above-mentioned embodiments, the preparation method comprising the following steps:
[0042] Add linear homopolypropylene, ethylene-propylene random copolymer, nucleating agent and heat stabilizer into a screw extruder according to the mass ratio for melt mixing, extrude and granulate.
[0043] Mixing equipment can choose twin-screw extruder. In one of the embodiments, the temperature of each section of the twin-screw extruder is set at 190°C to 240°C. Further, in one of the embodiments, the temperature of each section of the twin-screw extruder is set at 200°C to 220°C.
[0044] Furthermore, the present invention also provides a method for manufacturing a structural member, the method adopts a plurality of parts for vibration friction welding, and the plurality of parts are made of the polypropylene material in any one of the above-mentioned embodiments.
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Embodiment 1
[0053] Linear homopolypropylene with a weight average molecular weight of 2.9×105 and a molecular weight distribution width of 4.1, an ethylene-propylene random copolymer with a weight average molecular weight of 3.3×105, a molecular weight distribution width of 4.8 and an ethylene content of 3.5%, phosphate The nucleating agent and heat stabilizer are mixed according to the mass ratio of 94:5:0.2:0.8, and melted, blended and granulated on a twin-screw extruder. Then, the corresponding mechanical tensile sample and sample A for welding are injection-molded on the injection molding machine, and the sample A is welded under a certain vibration friction welding process to form a sample B, and the sample B is heat-treated at a certain temperature to obtain the final sample c. The process conditions are: extrusion temperature 210°C, injection molding temperature 210°C, vibration welding amplitude 0.6mm, welding depth 1.2mm, welding pressure 40Bar, welding holding pressure 35Bar, we...
Embodiment 2
[0055] Linear homopolypropylene with a weight average molecular weight of 2.9×105 and a molecular weight distribution width of 4.1, an ethylene-propylene random copolymer with a weight average molecular weight of 3.3×105, a molecular weight distribution width of 4.8 and an ethylene content of 3.5%, phosphate The nucleating agent and heat stabilizer are mixed according to the mass ratio of 94:5:0.2:0.8, and melted, blended and granulated on a twin-screw extruder. Then, the corresponding mechanical tensile sample and sample A for welding are injection-molded on the injection molding machine, and the sample A is welded under a certain vibration friction welding process to form a sample B, and the sample B is heat-treated at a certain temperature to obtain the final sample c. The process conditions are: extrusion temperature 210°C, injection molding temperature 210°C, vibration welding amplitude 0.6mm, welding depth 1.2mm, welding pressure 40Bar, welding holding pressure 35Bar, we...
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