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

A polytetrafluoroethylene lip and polytetrafluoroethylene technology, which is applied in the field of polytetrafluoroethylene lip material for seals and its processing technology, can solve the problems of large friction factor, lip aging and failure, and poor oil seal followability. , to achieve excellent sealing performance, reduce friction performance and improve wear resistance.

Pending Publication Date: 2022-04-12
JIANGMEN GELEIYATE FLUID SEALING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ma...

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A processing technology for a polytetrafluoroethylene lip material for a seal, comprising the following steps:

[0048] S1: Weighing materials: Weigh 74 parts of modified polytetrafluoroethylene, 7 parts of polyimide, 6 parts of polyphenylene ester, 3 parts of molybdenum disulfide, 1 part of ethylene bisstearamide, and chromium oxide according to parts by weight. 1 part, 8 parts of nano-zinc oxide for standby;

[0049] S2: Mixing: Add modified polytetrafluoroethylene, polyimide, and polyphenylene through the main feeding port of the twin-screw extruder, and then add molybdenum disulfide, ethylene bisstearamide, chromium oxide, nano Zinc oxide is added from the auxiliary feed inlet of the twin-screw extruder, melted and blended and extruded, and the composite material is obtained after cooling;

[0050] The preparation of modified polytetrafluoroethylene comprises the following steps: (1) clean the polytetrafluoroethylene, place the dried polytetrafluoroethylene in an A...

Embodiment 2

[0060] A processing technology for a polytetrafluoroethylene lip material for a seal, comprising the following steps:

[0061] S1: Weighing: Weigh 78 parts of modified polytetrafluoroethylene, 6 parts of polyimide, 5 parts of polyphenylene, 4 parts of molybdenum disulfide, 0.8 parts of ethylene bisstearamide, chromium oxide 0.8 parts, 5.4 parts of nano-zinc oxide for standby;

[0062] S2: Mixing: Add modified polytetrafluoroethylene, polyimide, and polyphenylene through the main feeding port of the twin-screw extruder, and then add molybdenum disulfide, ethylene bisstearamide, chromium oxide, nano Zinc oxide is added from the auxiliary feed inlet of the twin-screw extruder, melted and blended and extruded, and the composite material is obtained after cooling;

[0063] The preparation of modified polytetrafluoroethylene comprises the following steps: (1) clean the polytetrafluoroethylene, place the dried polytetrafluoroethylene in an AB0.5-60 high frequency and high pressure t...

Embodiment 3

[0073] A processing technology for a polytetrafluoroethylene lip material for a seal, comprising the following steps:

[0074] S1: Weighing materials: Weigh 81 parts of modified polytetrafluoroethylene, 5 parts of polyimide, 5 parts of polyphenylene ester, 3 parts of molybdenum disulfide, 0.5 parts of ethylene bisstearamide, zirconia 0.5 parts, 5 parts of nano-zinc oxide for later use;

[0075] S2: Mixing: Add modified polytetrafluoroethylene, polyimide, and polyphenylene through the main feeding port of the twin-screw extruder, and then add molybdenum disulfide, ethylene bisstearamide, zirconia, nano Zinc oxide is added from the auxiliary feed inlet of the twin-screw extruder, melted and blended and extruded, and the composite material is obtained after cooling;

[0076]The preparation of modified polytetrafluoroethylene comprises the following steps: (1) clean the polytetrafluoroethylene, place the dried polytetrafluoroethylene in an AB0.5-60 high frequency and high pressur...

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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,...

Claims

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Application Information

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IPC IPC(8): C08L27/22C08L79/08C08L67/04C08K3/22C08K3/30C08K5/20C08K13/02C08J5/18
Inventor 唐慧张万平范涛周志锋何礼荣
Owner JIANGMEN GELEIYATE FLUID SEALING TECH CO LTD
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