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"
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.
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.
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.