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
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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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