PHOTOCONDUCTIVE COATING PHOSPHOR POWDER FOR MANUFACTURING ELECTROPHOTOGRAPHICAL SCREEN OF CRT AND COATING METHOD OF PHOSPHOR POWDER THEREOF

摘要

The present invention provides a powdered phosphor for producing a dry electrophotographic screen of a cathode ray tube having excellent chargeability and fluidity and excellent conductivity at exposure, and a coating method thereof.;The phosphor particles have a 1% by weight photoconductive film formed on the surface thereof. In addition, the photoconductive film coating method of the present invention is bisdimethyl phenyl diphenyl butatriene in toluene or xylene, trinitrofluorenone (TNF) and ethyl anthraquinone (EAQ). Primary dispersion step of dispersing 0.01 to 10% by weight of at least one UV-reactive substance and 1 to 30% by weight of polystyrene as a polymer binder; An addition step of slowly adding the phosphor powder to the primary dispersion; A second dispersion step of dispersing toluene or xylene again in the result of the addition step; A filtering step of filtering the result of the second dispersion step; A drying step of drying the filtered result in the filtering step; And a sieve step of filtering the resultant dried in the drying step.;Accordingly, the photoconductive film-coated phosphor has superior charging and flow characteristics and excellent conductivity during exposure, thereby improving workability and improving productivity in the screen manufacturing process.