The PTFE filling technology in China is all completed by processing and production enterprises. For the preparation of parts and components in the automobile and other industries, the modification methods toaster bag mainly include surface modification, filling modification and blending modification. The above-mentioned surface modification methods are mainly suitable for PTFE membranes. These fillers are required to withstand the sintering temperature of PTFE; they do not react with PTFE; In addition, it has a certain particle size and can improve some physical and chemical properties of PTFE. Thereby increasing its wettability, improving its surface activity, and easy to composite with other materials.
Filling modification Add fillers to PTFE to improve and overcome the shortcomings of PTFE. Surface deposition modification, immersing PTFE in a colloidal solution of some metal hydroxides, so that colloidal particles are deposited on the surface of PTFE. The main idea is to attract polar groups and increase the interface bonding force.In order to improve the defects of PTFE, PTFE can be modified by a variety of methods such as reinforcement, filling, compounding and blending to make up for its own defects, so that the developed composite materials are widely used in machinery, electronics and aerospace.
Surface modification Because PTFE's extremely low surface activity and non-stick properties limit its compounding with other composite materials, certain surface modifications must be made to PTFE materials to improve their surface activity. Treating PTFE with certain chemical reagents can improve its surface activity. Chemical corrosion modification. Commonly used techniques include surface activation technology, which can use high-energy radiation to defluorinate the surface, and fluorinate the surface with other materials under certain equipment and conditions; treat PTFE materials with low-temperature plasma with some inert gases to produce carbon ; fluorine or Carbon; the breaking of the carbon bond generates a large amount of free radicals to increase the surface free energy of PTFE and improve its wettability and adhesion; PTFE is immersed in molten potassium acetate and processed at a suitable temperature to form a certain activity Activated layer: Heat treatment of PTFE in a mixture of sodium hydroxide and dipropylene melamine at a certain ratio can increase its surface activity; PTFE can form an activated layer that can be glued after corona treatment with a certain strength and time.
Generally, PTFE membranes can be well bonded and compounded with other materials after proper treatment, which is widely used in the design and manufacture of chemical anti-corrosion villages, sealing products and lubricating devices. These chemical reagents can be sodium metal ammonia solution, sodium naphthalene tetrahydrofuran solution, alkali metal amalgam, iron pentacarbonyl solution, etc. It is worth noting that PTFE filling technology abroad is completed by PTFE resin manufacturers.. Improve the pressure resistance, wear resistance and cooling properties of PTFE by filling different fillers such as inorganic, metal and organic polymers in PTFE resin. At present, filled PTFE products are the largest production of PTFE resin products
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