As treatment manner and device null of the powder body by the atmospheric pressure glow

摘要

PROBLEM TO BE SOLVED: To improve the hydrophilicity of hydrophobic powder having poor dispersibility by supplying the powder between disk-shaped electrodes which face each other and at least one of which rotate, imparting centrifugal force to the powder and impressing a high-frequency voltage between the electrodes, thereby generating atm. glow discharge plasma. SOLUTION: Dielectric substances 3, 3 are stuck to the electrodes 2, 2 arranged in a reaction vessel 2. These dielectric substances 3, 3 are disposed to face each other at a specified spacing. The air in this reaction vessel 1 is replaced with a gaseous mixture and the high-frequency voltage is impressed between the electrodes 2 and 2 from a high-frequency power source 11 to generate the glow discharge. The upper part of the reaction vessel 1 is provided with a powder tank 5 and the powder material to be treated is dropped from the lower part of this tank through a rotary metering valve 6 into the raw material supplying port of the upper electrode 2 so as to be supplied into the glow discharge atmosphere. As a result, the powder is moved by imparting the kinetic energy to the powder and is simultaneously subjected to the plasma treatment, by which the surfaces of the powder are uniformly treated and the hydrophilicity thereof is improved.