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Microporous oil-containing self-lubricating polytetrafluoroethylene (PTFE) material for sealing and preparation method and application thereof

A PTFE and self-lubricating technology, which is applied in the field of microporous oil-containing self-lubricating PTFE materials for sealing and its preparation, can solve the problems of reducing the self-lubricating performance of PTFE and increasing the friction coefficient, so as to achieve good self-lubricating effect, relieve stress concentration, The effect of improving the service life of the machine

Active Publication Date: 2012-07-18
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, these modification methods inevitably reduce the self-lubricating properties of PTFE and increase the friction coefficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Polytetrafluoroethylene M-18 (daikin, Japan, prepared by suspension method, particle size 20 μm), naphthalene (average particle size 10 μm) and hydraulic oil were mixed in a mass ratio of 98:1:1.

[0029] First, fully mix polytetrafluoroethylene M-18 and naphthalene, use 20Mpa molding pressure molding, hold pressure for 30 minutes, sinter (from room temperature to 330 ℃ at 30 ℃ / hour, constant temperature for 1 hour, at 20 ℃ / hour Raise the temperature to 380°C, keep the temperature constant for 1 hour, cool down to 330°C at 20°C / hour, keep the temperature at 1 hour, and then cool down to room temperature at a cooling rate of 20°C / hour), to produce a porous polytetrafluoroethylene semi-finished product. Soak the porous polytetrafluoroethylene semi-finished product in hydraulic oil, put it into a vacuum oven with a vacuum of 0.8 atmospheres, and keep the temperature at 30°C for 72 hours to prepare a microporous oil-containing self-lubricating PTFE material for sealing. ...

Embodiment 2

[0031] Polytetrafluoroethylene CGM-16 (prepared by Wu Chenguang, Zhongwu, Sichuan, with a particle size of 70 μm), naphthalene (average particle size of 100 μm) and heat transfer oil are mixed in a mass ratio of 98:1:1.

[0032] First, fully mix polytetrafluoroethylene CGM-16 and naphthalene, use 30Mpa molding pressure molding, hold the pressure for 15 minutes, and sinter (from room temperature to 360°C at 10°C / hour, constant temperature for 10 hours, at 10°C / hour The cooling rate of cooling is lowered to room temperature), and the porous polytetrafluoroethylene semi-finished product is made. Soak the porous polytetrafluoroethylene semi-finished product in heat-conducting oil, put it into a vacuum oven with a vacuum degree of 0.5 atmospheres, and keep the temperature at 100°C for 10 hours to prepare a microporous oil-containing self-lubricating PTFE material for sealing.

Embodiment 3

[0034] Polytetrafluoroethylene M-18 (Daikin, Japan, prepared by suspension method, particle size 20 μm), naphthalene (average particle size 200 μm) and gear oil were mixed in a mass ratio of 50:30:20.

[0035] First, fully mix polytetrafluoroethylene M-18 and naphthalene, use 40Mpa molding pressure molding, hold the pressure for 1 minute, sinter (from room temperature to 320 °C at 80 °C / hour, constant temperature for 10 hours, at 80 °C / hour Raise the temperature to 380°C, keep the temperature constant for 0.5 hours, cool down to 320°C at 80°C / hour, hold the temperature for 10 hours, and then cool down to room temperature at a cooling rate of 80°C / hour) to produce a porous polytetrafluoroethylene semi-finished product. Soak the porous polytetrafluoroethylene semi-finished product in gear oil, put it into a vacuum oven with a vacuum of 0.2 atmospheres, and keep the temperature at 150°C for 2 hours to prepare a microporous oil-containing self-lubricating PTFE material for seal...

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Abstract

The invention discloses a microporous oil-containing self-lubricating polytetrafluoroethylene (PTFE) material for sealing and a preparation method and application thereof. The PTFE material consists of the following components in percentage by mass: 50 to 98 percent of PTFE resin, 1 to 30 percent of naphthalene and 1 to 20 percent of oil. The method comprises the following steps of: mixing the PTFE resin and the naphthalene, performing die pressing, and sintering to prepare a porous PTFE semi-finished product; and soaking the porous PTFE semi-finished product in the oil, putting into a vacuum box, and keeping in vacuum for at least 2 hours to obtain the microporous oil-containing self-lubricating PTFE material for sealing. The microporous oil-containing self-lubricating PTFE material for sealing has high self-sealing property, lubricating property and elasticity, a good self-lubricating effect can be achieved even if the oil is not changed for a long time when the material is used as a sealing material, and a long-acting sealing effect is achieved; and if an anti-rusting agent permeates pores, machine equipment can be protected, and the service life of a machine is prolonged.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene material, in particular to a microporous oil-containing self-lubricating PTFE material for sealing and a preparation method and application thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent chemical stability, wide service temperature, good corrosion resistance and other excellent properties and is widely used in chemical industry, medicine, environmental protection, nuclear industry, daily necessities and other industries. [0003] However, PTFE material is easy to cold flow, has poor creep relaxation resistance, and poor compression resilience, which seriously restricts its application in the sealing industry. Therefore, at present, methods such as filling modification, composite modification, and expansion modification are mostly used to improve PTFE materials. Such as: the expanded PTFE material that adopts the preparation method of expanded microporous polytetraf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L91/00C08K5/01C09K3/10
Inventor 叶素娟吴文涛谭锋曾幸荣邓联勇
Owner GUANGZHOU MECHANICAL ENG RES INST
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