PTFE (polytetrafluoroethylene) powder plasma hydrophilic treatment

2022-04-09   Pageview:778

PTFE (polytetrafluoroethylene) powder is widely used in various solvent-based coatings and powder coatings: plastic coatings, wood paints, coil coatings, light-curing coatings, paints and other additives in products to improve their release performance, surface rub resistance Scratch, lubricity, chemical resistance, weather resistance and water resistance. PTFE micropowder can be used alone as solid lubricant instead of liquid lubricant. It can also be used to improve the fluidity of the ink. As an anti-wear agent, it is usually added in an amount of 1-3wt%. It can also be used for non-stick coating. The usual addition amount does not exceed 5wt%. Its organic solvent dispersion can also be used as a release agent. It can also be used as a high-efficiency anti-drip agent in various plastics such as environmentally friendly flame retardants ABS, polycarbonate (PC), polyurethane (PU), and polystyrene (PS).

Hydrophilicity comparison of ptfe wax powder before and after plasma treatment

Polytetrafluoroethylene (PTFE) is a highly crystalline polymer of tetrafluoroethylene monomer. It also has excellent electrical insulation, low surface tension and friction coefficient, non-flammability, atmospheric aging resistance and high and low temperature adaptability, and Has high mechanical properties.

However, due to its highly symmetrical structure, no active groups, and high crystallinity, PTFE is a very strong non-polar material. This strong non-polarity makes it highly hydrophobic, chemically inert, and low in surface energy. It is not easy to wet, and the adhesion performance with other materials is very low, which greatly limits its application. Therefore, in order to make PTFE have wider and wider applications, its surface must be treated to increase its surface energy and improve its hydrophilicity.

Small powder plasma cleaner

Plasma treatment is one of the rapidly developing technologies for PTFE surface modification in recent years. The principle of plasma modification is to activate the surface by bombarding or injecting ions into the surface of the polymer to break bonds or introduce functional groups to improve the adhesion of the material surface. Commonly used gases are oxygen, hydrogen, nitrogen, carbon tetrafluoride, argon, etc. The bombardment of inert gas plasma can change the surface structure of the compound.

Plasma contains active particles such as electrons, ions, and free radicals. Plasma surface modification includes physical modification and chemical modification. Physical modification is the bombardment of the polymer surface by electrons and ions, so that the chemical disconnection of the polymer chain is broken, a degradation reaction occurs, and the formed degradation products are deposited on the polymer surface. Chemical modification is the introduction of functional groups by the chemical reaction of free radicals on the surface of the polymer, and the chemical composition of the surface is changed. Both physical and chemical modifications will result in changes in surface properties. In the plasma treatment process, the introduction of functional groups and the degradation reaction are inseparable, but are carried out simultaneously, and the degradation reaction is inevitable. The key to effective surface modification is to reduce the degradation reaction as much as possible and make the functional group Attraction dominates.

Large powder plasma cleaning machine

Ptfe powder modification uses a powder plasma cleaning machine. Plasma acts on the powder, which can purposefully change the physical and chemical properties of the powder. On the premise of maintaining the original performance of the powder, it can give its surface a new surface. It can change the surface properties from hydrophobicity to hydrophilicity or from hydrophilicity to hydrophobicity, thereby improving the wettability of the surface of the powder particles, enhancing the interface compatibility of the powder particles in the medium, and making the particles easier Disperse in water or organic compounds. Surface modification of powder materials is an important method for material preparation, new materials, new processes and new product development, which improves the added value of powder materials and expands the application fields of powder materials.


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