PROJECTION TYPE CATHODE-RAY TUBE

摘要

PURPOSE:To prevent lowering of light transmission factor due to coloring of refrigerant under high temperature operation by adding ethylene oligomer of 10ppm-20% into refrigerant composed of mixture liquid of ethylene glycol and water. CONSTITUTION:The refrigerant 12 is composed of mixture liquid of ethylene glycol and water and added with 10ppm-20% ethylene oligomer. Ethylene oligomer is the mixture of ethylene glycol polymer and when adding more than 10ppm, decomposition of ethylene glycol through Na or K dissolved from the panel glass or its K-reinforced layer is prevented to completely eliminate flaw due to coloring on the screen. While when adding ethylene oilgomer excessively, the viscosity of the cold liquid 12 will increase to lower the work efficiency when injecting through an injection port 11 while motion through convection is hindered to lower the radiation effect thereby the adding amount is limited within 20%.