GAS DISCHARGE DEVICE FOR PLASMA TREATMENT AT ATMOSPHERE PRESSURE OF SURFACE OF BIOCOMPATIBLE POLYMERS Russian patent published in 2021 - IPC H05H1/24 H01J1/304 C23C4/12 

FIELD: polymers.

SUBSTANCE: invention relates to the field of generation of low-temperature nonequilibrium argon plasma at atmosphere pressure and can be used to create cold plasma sources based on a low-current surface discharge in atmospheric pressure argon with a dielectric barrier at the anode, as one of the effective methods for modifying the surface characteristics of biocompatible polymers, in particular, polytetrafluoroethylene, by plasma treatment. The gas discharge device for treating the surface of biocompatible polymers with plasma at atmosphere pressure contains an electrode system consisting of a cold cathode and a flat anode with a gas flow in the discharge gap, a modifiable polymer, a high-voltage power source and a gas injection system. The cold cathode is a steel rod with a diameter of 1.5-2 mm with a rough radius of the tip of 25 microns and it is loaded on an adjustable ballast resistance of at least 1 mOhm, the flat anode is made in the form of a steel circle with a diameter of 3-24 cm and it is installed perpendicular to the cold cathode. The center of symmetry of the anode is located at a distance of 30-100 mm from the tip of the cold cathode, the cathode and the anode are placed in an argon medium pumped longitudinally or perpendicular to the cathode, while the modifiable polymer with a thickness of 10-100 microns is made in the form of a circle or rectangle, respectively, with a diameter or diagonal equal to the diameter of the anode, and is held on the anode by the sharpened edge of the end cut of a steel cap washer electrically connected to the anode.

EFFECT: invention simplifies of the device while increasing the stability of its operation and ensures a more uniform and effective effect of low-temperature plasma on extensive surfaces.

1 cl, 3 dwg, 1 tbl