PTFE compound piston ring and preparation method thereof

A PTFE, piston ring technology, applied in the field of PTFE composite piston ring and its preparation, can solve the problems of small friction coefficient, thermal stability, poor dimensional stability, low dielectric strength, etc., and achieve excellent mechanical properties, comprehensive mechanical properties improvement, The effect of increasing internal stress

Inactive Publication Date: 2019-04-09
NANJING COMPTECH COMPOSITES CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Polytetrafluoroethylene (PTFE) is a polymer material with excellent comprehensive properties. It has excellent high and low temperature resistance and chemical corrosion resistance, and has excellent dielectric properties, extremely small friction coefficient and good thermal stability. It can be used in- Long-term use at 260°C~260°C, but pure PTFE has disadvantages such as cold flow, poor dimensional stability, low dielectric strength, and large wear.

Method used

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  • PTFE compound piston ring and preparation method thereof
  • PTFE compound piston ring and preparation method thereof

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Experimental program
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Embodiment 1-3

[0021] The preparation method of this PTFE composite piston ring is:

[0022] (1) Mix by dry method, add PTFE powder and PI powder in proportion to the high-speed mixer, stir evenly at high speed, take it out, and place it for 2~6h;

[0023] (2) Use a press for cold-press forming at a pressure of 10-30 MPa, hold the pressure for 1-5 minutes, and demould to obtain a preformed sample;

[0024] (3) Put the preformed sample into the sintering furnace and sinter at 380±5°C for 3~6h;

[0025] (4) Naturally cool the sintered blank to 60~120°C, then place it in a metal tube, heat it to 180~260°C, with a heating rate of 8~30°C / h; keep it at a constant temperature; then drop it to 150°C~room temperature and take it out , the cooling rate is 5~12℃ / h;

[0026] (5) Machining the annealed blank to obtain a formed piston ring product.

[0027] Among them, PTFE is suspended fine powder with a particle size of 25 μm to 40 μm and an apparent density of 400 to 500 g / L. The particle size of th...

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Abstract

The invention discloses a PTFE compound piston ring. The piston ring is characterized by being prepared from a PTFE compound material which is prepared from 76-85 percent of PTFE and 15-24 percent ofPI in percentage by mass. The invention further discloses a preparation method of the PTFE compound piston ring. Polyimide PI is a heat-resistant polymer material with stable aromatic heterocycle structural unit, has remarkable thermal stability, has the glass state temperature Tg of 260 DEG C or above, can endure the high temperature of 250-400 DEG C, has excellent mechanical performance, radiation resistance and solvent resistance, has good frictional wear performance in high-temperature, high / low-pressure, high-speed and other extreme environments. The hardness, impact strength and bendingstrength of the compound material can be improved after the PI is added into PTFE, the comprehensive mechanical performance can be promoted, toughness of PTFE substrate resin can be assisted due to acertain amount of PI, and the crack propagation and toughening performance of PTFE can be improved.

Description

technical field [0001] The invention relates to a PTFE composite piston ring and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polytetrafluoroethylene (PTFE) is a polymer material with excellent comprehensive properties. It has excellent high and low temperature resistance and chemical corrosion resistance, and has excellent dielectric properties, extremely small friction coefficient and good thermal stability. It can be used in- Long-term use at 260°C~260°C, but pure PTFE has disadvantages such as cold flow, poor dimensional stability, low dielectric strength, and large wear. [0003] The piston ring is a ring-shaped part embedded in the piston groove. It plays the role of sealing air and maintaining pressure in the air compressor. Performance is very important. Contents of the invention [0004] The object of the present invention is to provide a PTFE composite piston ring with good mechanical propert...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L79/08C08J7/00F04B39/00
CPCC08J7/08C08J2327/18C08J2479/08C08L27/18C08L2201/08F04B39/00C08L79/08
Inventor 杨文光靳予孙克原王孝刚夏炎陈朝曦林丰焦小东陈佩民徐小曼刘雪梅
Owner NANJING COMPTECH COMPOSITES CORP
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