Polytetrafluoroethylene sealing friction material for hydraulic oil cylinder and preparation method thereof

A polytetrafluoroethylene, sealing friction technology, applied in the field of sealing friction materials, can solve problems such as no clear application of sealing parts, and achieve the effect of reducing stress, ensuring service life and reliability, and high strength

Active Publication Date: 2022-02-11
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention patent has better controlled the heating temperature and pressure and obtained good performance indicators, it does not specify the specific application occasions of the seal

Method used

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  • Polytetrafluoroethylene sealing friction material for hydraulic oil cylinder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 50% by mass of polytetrafluoroethylene powder, 40% of carbon fiber and 10% of graphite powder were mixed in a high-speed mixer to prepare a billet, the rotation speed was 1500 rpm, and the mixing time was 1 minute. After taking it out and standing it for 15 minutes, put it back into the high-speed mixer, and mix again according to the same rotation speed and time. The mixed billet was cold-pressed in a mold at room temperature, with a cold-pressing speed of 0.1 mm / s, a final cold-pressing pressure of 40 MPa, and a holding time of 5 minutes. The billet was removed from the mold and left to stand for 24 hours. Sinter the above formed billet in a sintering furnace with a heating rate of 10°C / hour, a holding temperature of 370°C, a holding time of 2 hours, and a cooling rate of 10°C / hour to obtain a PTFE sealing material. Test the wear resistance and friction reduction performance of PTFE sealing material in 46# anti-wear hydraulic oil, using a reciprocating friction testi...

Embodiment 2

[0025] Change the mass ratio in Example 1 to 50% polytetrafluoroethylene powder, 35% carbon fiber and 15% graphite powder, and keep other process conditions unchanged to obtain the PTFE sealing material. Test the wear resistance and friction reduction performance of PTFE sealing material in 46# anti-wear hydraulic oil, using a reciprocating friction testing machine, the load is 28MPa, the reciprocating speed is 0.2m / s, and the wear time is 1h. The results are shown in Table 1. .

Embodiment 3

[0027] Change the mass ratio in Example 1 to 50% polytetrafluoroethylene powder, 30% carbon fiber and 20% graphite powder, and keep other process conditions unchanged to obtain the PTFE sealing material. Test the wear resistance and friction reduction performance of PTFE sealing material in 46# anti-wear hydraulic oil, using a reciprocating friction testing machine, the load is 28MPa, the reciprocating speed is 0.2m / s, and the wear time is 1h. The results are shown in Table 1. .

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Abstract

The invention discloses a polytetrafluoroethylene sealing friction material for a hydraulic oil cylinder and a preparation method thereof and belongs to the field of sealing friction materials. The prepared material is resistant to pressure, oil and abrasion, low in friction coefficient and suitable for a reciprocating hydraulic sealing system with the pressure being 28 MPa and the reciprocating speed being 0.2 m / s or below. The preparation method comprises the steps of high-speed mixing, cold press molding, slow heating, high-temperature sintering and slow cooling. Through matching of the wear-resistant phase filler and the antifriction phase filler, slow heating and slow cooling, stress in a blank is reduced, the crystallinity of PTFE is improved, and the sealing material with high strength, good toughness, high wear resistance and low friction is prepared; and the sealing material is suitable for a reciprocating hydraulic sealing system with the pressure being 28 MPa and the reciprocating speed being 0.2 m / s or below, and the service life and reliability of a sealing piece are guaranteed.

Description

technical field [0001] The invention belongs to the field of sealing friction materials, and in particular relates to a polytetrafluoroethylene sealing friction material for hydraulic oil cylinders and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has the characteristics of good chemical stability, high and low temperature resistance, non-adhesion, self-lubrication, etc., and has been widely used in the field of hydraulic sealing. Because the fluorine atoms between the PTFE macromolecular chains repel each other, the attraction between the molecules is small. When subjected to shear stress, the PTFE molecules are more likely to slip, resulting in insufficient wear resistance. In practical engineering applications, fillers are often added to reduce the wear rate of PTFE and improve the tribological properties. The fillers added include copper powder, carbon fiber, glass fiber, polyphenylene ester, graphite, PEEK, etc. In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K7/06C08K3/04
CPCC08K7/06C08K3/04C08L27/18
Inventor 吕晓仁张天亮
Owner SHENYANG POLYTECHNIC UNIV
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