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PTFE (polytetrafluoroethylene) composite, preparation method thereof and leakproof sealing ring using composite

A technology of polytetrafluoroethylene and composite materials, which is applied in the field of polytetrafluoroethylene composite materials, making the material, and non-leakage sealing rings, which can solve the problem that the sealing performance cannot meet the requirements of use, cannot meet the long-term use, and cannot guarantee the sealing effect, etc. problems, to achieve the effect of breaking through the shackles of formula design and production methods, making the production process clear, and solving the incompatibility of wear resistance and radiation resistance

Inactive Publication Date: 2019-07-23
杨家义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rubber material has excellent sealing performance, but it is not suitable for dry friction, and it is easy to age. Graphite hard friction materials can dry friction, but the sealing performance cannot meet the requirements of use
Conventional polytetrafluoroethylene composite materials have excellent dry friction performance and sealing performance, and are suitable for sealing rings in these parts, but have poor radiation resistance and cannot meet the requirements of long-term use.
In addition, in order to facilitate installation and maintenance, this type of sealing ring generally adopts the form of an overlapping joint. The sealing ring with a conventional structure has a leakage channel at the overlapping part, which cannot guarantee a complete sealing effect, and the working medium always has a small amount of internal leakage or external leakage. , unable to meet the requirements of zero leakage in some fields

Method used

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  • PTFE (polytetrafluoroethylene) composite, preparation method thereof and leakproof sealing ring using composite
  • PTFE (polytetrafluoroethylene) composite, preparation method thereof and leakproof sealing ring using composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1), surface treatment

[0041] Take a certain weight of thermosetting polyimide powder, put it in a blast drying oven at 300°C, and dry it for 1 hour. When the temperature drops to 22°C, store it for future use (airtight);

[0042] 2), mixing

[0043] In the mixing chamber of the mixing equipment, drop into 80 parts by weight of suspended polytetrafluoroethylene resin, 15 parts by weight of dried thermosetting polyimide powder and 5 parts by weight of copper calcium titanate powder, and mix uniformly to obtain the mixture. take out for use;

[0044] 3), suppression

[0045] Measure the mixture obtained in step 2) into the mold cavity of the automatic hydraulic press, open the equipment to press, the pressure per unit area is 50MPa, after pressing, demould and take out the material blank;

[0046] 4), sintering

[0047]Put the material blank obtained in step 3) into a PLC automatic control oven, and control the temperature change in the cavity according to the follow...

Embodiment 2

[0051] 1), surface treatment

[0052] Take a certain weight of thermosetting polyimide powder, put it in a blast drying oven at 300°C, and dry it for 1 to 2 hours. When the temperature drops to 23°C, store it for future use (airtight);

[0053] 2), mixing

[0054] In the mixing chamber of the mixing equipment, drop into 78 parts by weight of suspended polytetrafluoroethylene resin, 18 parts by weight of dried thermosetting polyimide powder and 4 parts by weight of copper calcium titanate powder, and mix uniformly to obtain the mixture. take out for use;

[0055] 3), suppression

[0056] Measure the mixture obtained in step 2) into the mold cavity of the automatic hydraulic press, open the equipment for pressing, the pressure per unit area is 55MPa, after pressing and forming, demould and take out the material blank;

[0057] 4), sintering

[0058] Put the material blank obtained in step 3) into the oven, and control the temperature change in the cavity according to the fol...

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Abstract

The invention belongs to the field of composites and sealing parts and particularly relates to a PTFE (polytetrafluoroethylene) composite with anti-radiation, anti-wear and self-lubricating properties, a method for preparing the composite and a leakproof sealing ring using the composite. The disclosed PTFE composite is prepared from components in parts by weight as follows: 75-90 parts of suspending PTFE resin, 10-20 parts of thermosetting polyimide powder, 3-5 parts of ferroelectric ceramic powder and the like. The invention also discloses a preparation method of the material, which comprisesprocesses of drying, mixing, pressing, sintering, modification and the like. The invention also discloses the Z-shaped leakproof sealing ring prepared from the composite, which realizes the efficientsealing effect of a key host in the nuclear field. The sealing ring prepared from the PTFE composite can meet the sealing requirement under the dry friction work condition in the nuclear industry field, has excellent anti-radiation property and can guarantee effective operation of equipment and the safety of workers for a long term.

Description

technical field [0001] The invention belongs to the field of composite materials and seals, in particular to a polytetrafluoroethylene composite material with anti-radiation, wear resistance and self-lubricating properties, a method for making the material and a non-leakage sealing ring using the material. Background technique [0002] Polytetrafluoroethylene is a polymer material with a helical molecular chain structure. It has excellent chemical stability, non-combustibility, extremely low friction coefficient and good lubricity. It is known as the "King of Plastics" and is widely used Used in aerospace, defense industry, general machinery and other fields. However, its poor mechanical properties, large linear expansion coefficient, poor creep resistance (easy to cold flow), especially poor wear resistance and other defects limit its wide application to a certain extent. In order to improve the wear resistance of PTFE, it is usually to add inorganic and organic fillers to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L79/08C08K3/24C08J7/12
CPCC08J7/123C08J2327/18C08J2479/08C08K2201/003C08L27/18C08L2201/08C08L79/08C08K3/24
Inventor 杨家义
Owner 杨家义
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