Special modified high and low temperature resistant sealing part material produced by polytetrafluoroethylene regeneration method, sealing part and preparation method thereof

A polytetrafluoroethylene, high and low temperature resistant technology, applied in the field of high and low temperature resistant seal materials, can solve the problems of inability to make high and low temperature resistant, insufficient powder fineness, complicated production process, etc., and achieve good corrosion resistance and chemical resistance , good high and low temperature resistance, wide application field

Active Publication Date: 2009-12-23
义乌市秉杞氟塑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the initial process can obtain regenerated tetrafluoroethylene powder and products, there are still deficiencies in the production process and product quality: 1) the fineness of the powder is not enough, generally only reaches about 160 mesh; 2) tetrafluoroethylene waste The oil stains and stains in it cannot be resolved cleanly, which seriously restricts the scope of use, and it is impossible to manufacture special high-end products
3) The pollution sources and pollutants generated in the production process cannot be decomposed and cleaned, let alone the manufacture of high-grade, high-performance, multi-variety and high-efficiency new material products, because the production process equipment cannot remove stains to a certain degree of cleanliness ; 4) The production process is more complicated, the labor input is large, and the cost of milling will be increased by more than 50% compared with the existing research and development products, and it cannot be made into a high-grade seal material product with high and low temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this embodiment, the polytetrafluoroethylene modified high and low temperature resistant seal is made according to the following steps:

[0046] 1) Preparation of regenerated polytetrafluoroethylene powder: waste polytetrafluoroethylene materials are sorted and put into a washing machine for classification and cleaning, and then chopped by a shredder, with a particle size of 2 mm. Then use a high-speed rotary machine to impact into regenerated polytetrafluoroethylene fine powder. The rotation speed is 8500 revolutions per minute, and the fineness reaches 260 mesh. The equipment adopts the hardest imported stainless steel block.

[0047] 2) Mixing of raw materials: mix polytetrafluoroethylene regenerated fine powder with high-temperature magnesium oxide and alkali-free glass fiber powder, the weight ratio of the three is 60:15:25; high-temperature magnesium oxide (fineness above 400 mesh) and Alkali glass fiber powder (more than 300 mesh fineness) was purchased from N...

Embodiment 2

[0052] In this embodiment, the polytetrafluoroethylene modified high and low temperature resistant seal is made according to the following steps:

[0053] 1) Preparation of recycled polytetrafluoroethylene powder: waste polytetrafluoroethylene materials are sorted and put into washing machines to be sorted and cleaned separately. When cleaning, they are cleaned with detergent for convenience, and then shredded by a shredder. The particle size is 1 mm. Then use a high-speed rotary machine to impact into regenerated polytetrafluoroethylene fine powder. The rotation speed is 9000 revolutions per minute, and the fineness reaches 220 mesh. The equipment adopts the hardest imported stainless steel block.

[0054] 2) Mixing of raw materials: mixing regenerated polytetrafluoroethylene fine powder with high-temperature magnesium oxide and alkali-free glass fiber powder, and the weight ratio of the three is 50:20:30.

[0055] 3) Molding: Put the mixed powder into the mold and put it in...

Embodiment 3

[0059] In this embodiment, the polytetrafluoroethylene modified high and low temperature resistant seal is made according to the following steps:

[0060] 1) Preparation of regenerated polytetrafluoroethylene powder: the waste polytetrafluoroethylene materials are sorted into a washing machine for sorting and cleaning, and then chopped by a shredder, with a particle size of 2 mm. Then use a high-speed rotary machine to impact into regenerated polytetrafluoroethylene fine powder, the rotation speed is 9000 revolutions per minute, and the fineness reaches 200 mesh. The equipment adopts the hardest imported stainless steel block.

[0061] 2) Mixing of raw materials: mix the regenerated polytetrafluoroethylene fine powder with high-temperature magnesium oxide and alkali-free glass fiber powder, and the weight ratio of the three is 55:16:29.

[0062] 3) Molding: Put the mixed powder into the mold and put it into a molding machine for molding. The pressure is 40MPa, the mold tempera...

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Abstract

The invention provides a special modified high and low temperature resistant sealing part material produced by a polytetrafluoroethylene regeneration method, which consists of regenerative polytetrafluoroethylene powder processed by special step, high-temperature magnesium oxide and alkali-free glass fiber powder. A sealing part formed by processing the material has good high and low temperature resistant performance and can keep good using performance within the range of -220 DEG C-+350 DEG C, thereby not only keeping the unique chemical stability of the polytetrafluoroethylene, but also keeping the toughness and the broad operatability of a high temperature resistant and micro-fibrous internal unchanged structure of the material; furthermore, the sealing part also has the advantage of super-strong sealing property, wear resistance and lubricity, so that the range of applications is wider. The material can not only be used in the sealing field, but also be used in matching energy conservation and emission reduction of solar energy manufacturing industry, as well as equipment of military industry.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene sealing material, in particular to a specially modified high and low temperature resistant sealing material produced by a polytetrafluoroethylene regeneration method, the sealing and its preparation method. Background technique [0002] Seals are an essential part in the transmission process. The products are mainly used for supporting connections in large industries, and are widely used in aviation, petrochemical, chemical fiber textiles, machinery, metallurgy and mining and other fields. With the rapid development of modern industrial technology, the requirements for the equipment operating under special working conditions to be equipped with seals with high and low temperature resistance are getting higher and higher. Such as: Petroleum, chemical industry, thermal power, military industry, natural gas, automobile, emerging shipbuilding and other industries generally require the working temperature o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/22C08K7/14B29C43/58B29C67/04
Inventor 陈秉杞
Owner 义乌市秉杞氟塑科技有限公司
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