| 摘要 |
The present invention relates to an etching agent synthetizing method for a printed circuit board (PCB) and an LCD semiconductor comprising: a mixing step of stirring and mixing aqueous nitric acid and aminoguanidine hicarbonate; an adding step of adding aqueous sodium nitrate to a reaction product generated through the mixing step; an aging step for heating the reaction product to be aged after putting ammonia into the reaction product generated through the adding step; an acidity control step for cooling and adding sulfuric acid into the reaction product generated through the aging step to control the acidity of the reaction product; a cooling recrystallization step for cooling the reaction product generated through the acidity control step to be crystallized; and a filtering and drying step for filtering and drying the reaction product generated through the cooling recrystallization step. [Reference numerals] (AA) Start;(BB) End;(S101) Mixing step;(S103) Adding step;(S105) Aging step;(S107) Acidity adjustment step;(S109) Cooling and recrystallization step;(S111) Filtering and drying step |
