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PTFE resin composition

A resin composition, polytetrafluoroethylene technology, used in mechanical equipment, engine components, engine sealing and other directions, can solve the problem of poor lubricity, inability to prevent carbon fiber from falling off, deformation resistance (pressure resistance, wear resistance and sealing) Unsatisfactory performance, etc., to achieve the effect of excellent sealing performance, satisfying sealing performance and preventing falling off

Inactive Publication Date: 2015-11-11
EAGLE INDS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when these PTFE resin compositions are used as lip materials for the seals of automobile cooling water circulation pumps, since the liquid to be sealed is not oil with excellent lubricity, but cooling water with poor lubricity (with ethylene glycol aqueous solution as the main component Long Life Coolant (LLC)), so the loss of carbon fiber cannot be prevented due to the softening of the lip material due to sliding heat
Therefore, when using a sealing material, deformation resistance (pressure resistance), wear resistance and sealing performance are not satisfactory

Method used

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  • PTFE resin composition
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Examples

Experimental program
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Effect test

Embodiment 1

[0034] 90 parts (by weight; the same below) of modified PTFE (Teflon (registered trademark) 70-J, manufactured by Mitsui Dupont Fluoro Chemical; modified PTFE) and pitch-based curved carbon fibers (average fiber diameter 13 μm, average fiber length 90 μm, radius of curvature 517 μm) 10 parts are compounded by the above method, and then compression molded at about 60 to 70 MPa using a press or the like, and fired at 360 to 390° C. for 3 hours in a firing furnace.

[0035] Then, a lip seal as shown in the figure was fabricated by cutting, and the seal was operated for 1000 hours to conduct a sealing performance evaluation test. Product evaluation was performed according to the following criteria.

[0036] Deformation resistance:

[0037] The state of the lip after the test was visually observed. On the portion (waist A) where the sealing liquid side was bent on the inner diameter side of the lip seal 100, the case where no deformation was found was marked as ○, and the case whe...

Embodiment 2

[0045] In Example 1, the amount of modified PTFE was changed to 70 parts, and the amount of pitch-based curved carbon fiber was changed to 30 parts.

Embodiment 3

[0047] In Example 1, instead of pitch-based curved carbon fibers, highly graphitized pitch-based curved carbon fibers (average fiber diameter 13 μm, average fiber length 90 μm, radius of curvature 484 μm) were used in the same amount.

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Abstract

A PTFE resin composition comprising polytetrafluoroethylene or modified polytetrafluoroethylene in an amount between 70 and 90 wt.%, inclusive, and curved carbon fiber in an amount between 30 and 10 wt.%, inclusive. As a result of the addition of a prescribed amount of curved carbon fiber to PTFE or modified PTFE, this PTFE resin composition can be used effectively as a molding material that yields a water-pump lip-seal material that excels in terms of resistance to deformation, resistance to wear, and sealing performance with respect to cooling water. In particular, even if this PTFE resin composition is used in a seal for a cooling-water circulation pump in an automobile, shedding of the carbon fibers can be prevented effectively, even under the harsh conditions to which a cooling-water seal is subjected, and sufficient sealing performance is produced, with no cooling-water leakage or the like due to deformation or wear during use.

Description

technical field [0001] The present invention relates to PTFE resin composition. In more detail, it is related with the PTFE resin composition which can be used effectively as a molding material etc. of the lip seal for water pumps. Background technique [0002] Shaft seal materials are used as sealing members in sliding parts of automobile engines, transmissions, air conditioners, and other air conditioners, refrigerators, and the like. For this shaft seal material, it is required to reduce the leakage of the sealed fluid even in a severe environment with a high PV value (PV value: maximum surface pressure P × maximum peripheral speed V), and to be resistant to deformation and wear excellent. In addition, in order to reduce the loss of driving force and alleviate the thermal damage to the sealing system, it is also required to have low friction (low sliding heat generation). [0003] Conventionally, PTFE composite materials have been proposed as sliding materials for such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/04C08K7/06F16J15/32
CPCC08K7/06C09K3/1009F16J15/32C08L27/18
Inventor 松本敬宣
Owner EAGLE INDS
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