Polytetrafluoroethylene lip sheet material for sealing element and processing technology of polytetrafluoroethylene lip sheet material

Abstract

According to the polytetrafluoroethylene lip piece material for the sealing element and the processing technology of the polytetrafluoroethylene lip piece material, the added components and the technology are limited, the sealing performance of the lip piece material is greatly improved, the friction performance of the lip piece material is reduced, and the phenomena of severe abrasion and sticking burning cannot be generated on a product and a mating plate at the running speed of 60 m / s; polybenzoate and polyimide are selected to improve the wear resistance of polytetrafluoroethylene, synergistically enhance the mechanical strength of the lip sheet material and improve the following property of the oil seal; the method comprises the following steps: carrying out modification treatment on polytetrafluoroethylene by using aromatic polyamide fibers by using an electron beam irradiation modification method, and grafting side branches on double helix chains of the polytetrafluoroethylene; the prepared molybdenum disulfide has covalent functionalization; nano zinc oxide and ethylene bis stearamide are introduced; the prepared composite material needs to be placed for 3-5 days and then pressed, segmented sintering is adopted in the sintering process, the service life of the lip piece material is greatly prolonged, and the service life of the lip piece material prepared according to the method is longer than 8 years.

Description

technical field [0001] The invention relates to the field of lip materials, in particular to a polytetrafluoroethylene lip material for a sealing element and a processing technology thereof. Background technique [0002] With the development of society, high-end equipment such as construction machinery, commercial passenger cars, and new energy electric vehicles have higher and higher requirements for the speed of their crankshafts or transmission input shafts, and higher requirements are placed on the sealing performance of the lip materials used. Need to withstand high and low temperature, high line speed, high frequency beating. [0003] At present, the lip material is made of NBR and FKM rubber, but they have a large friction coefficient in the state of oil shortage or dry friction, and will age and fail due to the intense temperature rise of the lip. Moreover, NBR rubber has poor high-temperature resistance and high-speed resistance, and the lip is easy to age, harden,...

AI Technical Summary

Problems solved by technology

[0003] At present, the lip materials are made of NBR and FKM rubber, but they have a large friction coefficient in the state of oil shortage or dry friction, and will age and fail due to the sharp temperature rise of the lip.

Moreover, NBR rubber has poor high-temperature resistance and high-speed resistance, and the lip is easy to age, harden, become brittle and lose elasticity, and the leakage is serious

Although FKM rubber is resistant to high temperature, it is severely worn during high-speed rotation and is prone to leakage.

[0004] Since the 1990s, domestic enterprises have successively produced PTFE lip materials for seals, but the sealing effect is still far from the requirements. The main manifestations are: the oil pumping effect of the oil seal is not obvious; the follow-up of the oil seal Poor sex

For example, the linear speed of motors and air compressors of new energy vehicles is required to be 40m / s, but general products cannot meet the requirements; and the lips made of traditional materials for seals are mostly filled with copper powder filled with polytetrafluoroethylene, which is not wear-resistant , the material is hard, the followability is poor, there will be oil leakage, and the service life is short

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