Wear resistant polytetrafluoroethylene material and preparation method thereof
A technology of polytetrafluoroethylene and wear-resistant materials, which is applied in the field of polytetrafluoroethylene preparation, can solve the problems of low tensile strength, low elongation at break, high wear of polytetrafluoroethylene, etc., and achieve good self-lubricating properties, low shrinkage effect
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Embodiment 1
[0023] Put polytetrafluoroethylene, aluminum oxide, bronze powder, silicon dioxide and glass fiber into the reaction kettle and heat to 50°C, stir for 20min at a stirring speed of 100r / min, add the remaining raw materials, raise the temperature to 70°C, and stir for 30min, The stirring speed is 200r / min.
[0024] Put the mixed material into a twin-screw extruder for extrusion, the barrel temperature is 170°C, 180°C, 185°C, 190°C, 195°C and 200°C, the screw speed is 50r / min, the parison is pre-pressed, and the pressure is 45MPa , holding pressure for 30s, sintering and forming: 370°C, heat preservation for 1h.
[0025] The tensile strength of the product is 27MPa, the elongation at break is 300%; the Shore hardness is 60, the wear amount is 0.005mg; the relative density is 2.6, and the wear scar width is 3.5mm / h.
[0026] Example 2:
Embodiment 2
[0028] Put polytetrafluoroethylene, aluminum oxide, bronze powder, silicon dioxide and glass fiber into the reactor and heat to 70°C, stir for 40min at a stirring speed of 200r / min, add the remaining raw materials, heat up to 90°C, stir for 50min, The stirring speed is 400r / min.
[0029] Put the mixed material into a twin-screw extruder for extrusion, the barrel temperature is 170°C, 180°C, 185°C, 190°C, 195°C and 200°C, the screw speed is 60r / min, the parison is pre-pressed, and the pressure is 65MPa , holding pressure for 50s, sintering and molding: 390°C, heat preservation for 1h.
[0030] The tensile strength of the product is 28MPa, the elongation at break is 305%; the Shore hardness is 65, the wear amount is 0.004mg; the relative density is 2.6, and the wear scar width is 3.5mm / h.
[0031] Embodiment 3:
Embodiment 3
[0033] Put polytetrafluoroethylene, aluminum oxide, bronze powder, silicon dioxide and glass fiber into the reaction kettle and heat to 50°C, stir for 20min at a stirring speed of 100r / min, add the remaining raw materials, raise the temperature to 70°C, and stir for 30min, The stirring speed is 200r / min.
[0034] Put the mixed material into a twin-screw extruder for extrusion, the barrel temperature is 170°C, 180°C, 185°C, 190°C, 195°C and 200°C, the screw speed is 50r / min, the parison is pre-pressed, and the pressure is 50MPa , holding pressure for 35s, sintering and forming: 375°C, heat preservation for 1h.
[0035] The tensile strength of the product is 30MPa, the elongation at break is 310%; the Shore hardness is 70, the wear amount is 0.003mg; the relative density is 2.7, and the wear scar width is 3.5mm / h.
[0036] Embodiment 4:
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