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Polytetrafluoroethylene composite material for crankshaft oil seal and preparation method thereof

A technology of polytetrafluoroethylene and composite materials, applied in mechanical equipment, engine seals, engine components, etc., can solve the problems of high friction coefficient of polytetrafluoroethylene oil seals, damage by seals, and insufficient mechanical strength of products, and achieve The manufacturing method and process are simple, the friction factor is reduced, and the affinity is large

Active Publication Date: 2010-12-15
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to overcome the defects that the polytetrafluoroethylene oil seal produced simply by using inorganic filler modification has a large friction coefficient, great damage to the sealed parts and insufficient mechanical strength of the product, and provide a low friction coefficient Polytetrafluoroethylene composite material used for automobile engine crankshaft oil seal with good friction loss resistance and mechanical properties and preparation method thereof

Method used

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  • Polytetrafluoroethylene composite material for crankshaft oil seal and preparation method thereof
  • Polytetrafluoroethylene composite material for crankshaft oil seal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the mass percentage ratio of Example 1 in Table 1, polytetrafluoroethylene was weighed, aramid fibers and inorganic fillers were added to a high-speed mixer and stirred at a speed of 2700 rpm for 3 minutes, fully and uniformly mixed; Add uniform raw material powder into the mold cavity of the plastic hydroforming machine, pressurize unidirectionally to 50MPa at a rate of 3MPa / min at room temperature, hold the pressure for 50min, and demould to obtain a preformed sample; put the preformed sample in Put it into an electric furnace at a heating rate of 60°C / h, raise it from room temperature to 350°C for sintering and hold it for 8 hours to solidify, then control the cooling rate to 40°C / h, drop it below 140°C, and then cool it to room temperature naturally with the furnace. The polytetrafluoroethylene composite material blank is taken out; the polytetrafluoroethylene composite material product is obtained after the sintered and solidified polytetrafluoroethylen...

Embodiment 2

[0040] Weigh polytetrafluoroethylene according to the mass percentage ratio of Example 2 in Table 1, add aramid fibers and inorganic fillers into a high-speed mixer and stir for 2 to 3 minutes to fully mix the materials; add the above-mentioned uniformly mixed raw material powder In the mold cavity of a plastic hydroforming machine, at room temperature, when the rate of 3MPa / min is unidirectionally pressurized to 80MPa, after holding the pressure for 40min, the preformed sample is demoulded; °C / h heating rate, from room temperature to 365 °C and sintering for 6 hours to solidify, then control the cooling rate to 40 °C / h, drop to below 140 °C and then cool naturally to room temperature with the furnace, take out the PTFE composite material Blank: The sintered and solidified polytetrafluoroethylene composite blank is subjected to ordinary grinding and surface treatment to obtain a polytetrafluoroethylene composite product.

Embodiment 3

[0042] Weigh polytetrafluoroethylene, aramid fibers and inorganic fillers according to the mass percentage ratio of Example 3 in Table 1 and add them to a high-speed mixer and stir for 2 to 3 minutes to fully mix the materials; add the above-mentioned uniformly mixed raw material powder In the mold cavity of a plastic hydroforming machine, at room temperature, when the rate of 3MPa / min is unidirectionally pressurized to 100MPa, after holding the pressure for 30min, the preformed sample is demoulded; °C / h heating rate, from room temperature to 375 °C and sintering for 6 hours to solidify, then control the cooling rate to 40 °C / h, drop to below 140 °C and then naturally cool to room temperature with the furnace, take out the PTFE composite material Blank: The sintered and solidified PTFE composite material blank is subjected to ordinary grinding and finishing, and the PTFE composite material product is obtained after surface treatment.

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Abstract

The invention relates to a polytetrafluoroethylene composite material for crankshaft oil seal and a preparation method thereof. The composite material is composed of 60%-80% of polytetrafluoroethylene by mass, 8%-18% of an organic filler of aramid fiber by mass and an inorganic filler. The preparation method comprises the following steps: batching, mixing materials, pressurizing to 50-150Mpa, maintaining pressure for 10-50min, and press forming; sintering and curing the formed materials at the temperature of 350-400 DEG C for 4-8 hours; and cooling down the temperature to below 140 DEG C withthe cooling speed at 40 DEG C / h, and naturally cooling the cured materials in a furnace to room temperature to obtain the polytetrafluoroethylene composite material through aftertreatment. The oil seal obtained by the preparation method has better mechanical properties such as impact strength, tensile strength, compression strength, breaking elongation, hardness and the like; and the polytetrafluoroethylene composite material has lowered friction factors, enhanced lubricating effect and prolonged wearing life, and the material is especially suitable for the crankshaft oil seal of an automobile engine.

Description

technical field [0001] The invention belongs to the field of sealing materials, and relates to a sealing material and a preparation method thereof, in particular to a polytetrafluoroethylene composite material used for oil seals and a preparation method thereof. Background technique [0002] In the rotary motion sealing device of mechanical equipment, oil seal is widely used to prevent the leakage of working medium and prevent the intrusion of dust, water and air into the working body. According to the structural characteristics, the oil seal is a kind of lip seal ring. Because of its wide variety and its lip has greater resilience, it is another category from the lip seal ring; the sealing principle of the oil seal is based on the Between the oil seal and the shaft, there is a hydrodynamic oil film controlled by the oil seal edge, and a lubricating oil film with fluid lubrication characteristics exists. The rigidity of the oil film is just so that the contact end of the oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L77/10C08K7/14C08K3/04C08K3/26F16J15/32
Inventor 宋伟李书福杨健
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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