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PTFE Manufacturers Summarize Their Modification Methods

Jun 03, 2018

During  the use of Teflon products, if the compressive force exceeds the  acceptable limit, the Teflon gasket will generate cold flow and be  squashed, which will limit the sealing application. In  response to this situation, the engineering department and technical  department of Dechengwang chose to modify PTFE, mainly by compounding  PTFE with other materials or by surface treatment of composite  materials. Characteristics to achieve the purpose of modification. The  main methods for enhancing the performance of Teflon products are:  "surface modification", "filling modification", "blending modification"
Surface modification
The  surface modification methods of PTFE are mainly "plasma surface  modification", "sodium-naphthalene complex chemical treatment", "high  energy radiation graft modification", and "laser radiation  modification". The  most commonly used surface modification method is the  “sodium-naphthalene complex chemical treatment method” because the  chemical method is simple and quick. By  surface modification, a large amount of active free radicals are  generated on the PTFE surface, which creates the conditions for grafting  or adhesion in the next step. The  PTFE surface generates free radicals such as hydroxyl and oxygen under  plasma conditions, and it is easy to change the surface activity of PTFE  by grafting to suppress the surface inertness of PTFE.
Fill modification
PTFE  has many prominent features, but the need to add "filler" or  "additives", after the formation of composite materials to improve the  performance of PTFE fatigue crack resistance, wear resistance will also  be more prominent, Decheng Wang production The PTFE-filled modified products passed the harsh wear test and life test of our top 500 companies. We  can also add "graphite", "glass fiber", "bronze powder", "molybdenum  disulfide", "polyphenyl", "carbon fiber", "polyimide", "nano-materials"  and other materials as reinforcements. PTFE filler conditioner. Not  only has the wear resistance greatly improved, but the creep resistance  has also been significantly improved, and it can also meet the sealing  requirements under certain conditions.
Blended Surname
The  excellent properties of PTFE and other engineering plastics blending  modifications make it possible to complement each other, broadening the  application of materials. However,  PTFE has “extremely low surface energy” and “poor wettability” and is a  “highly inert material” and has poor compatibility with most polymers. Therefore,  proper surface treatment must be performed before the blend  modification, or appropriate components must be added during the  modification to improve the compatibility of PTFE with other polymers. Fundamentally solved the disadvantages of PTFE sealability.