| 摘要 |
PROBLEM TO BE SOLVED: To positively perform paint film separation, grain raising, descaling, and the like of an exterior wall of a building structure or the like and to dispense with secondary treatment to simplify work by using sodium bicarbonate of specific grain size as blasting material. SOLUTION: Sodium bicarbonate of about 0.2-5 mm in grain diameter is sprayed as blasting material with high pressure water or high pressure air to apply grinding/polishing/cleaning, washing, grain raising and paint film separation to the surface of concrete, stone or a metal plate. If the grain diameter of sodium bicarbonate is about 0.2 mm or less, it is too fine to obtain sufficient blasting effect, and if it is about 5 mm or more, a treated object is damaged because impact force is strong, and there is the possibility of blocking a nozzle, and moreover equipment is enlarged. Sodium bicarbonate is white monoclinic crystalline powder which is a safe substance to a human body, mainly used for the medicinal powder for the stomach and other additives as medicine or as edible baking powder or the like, and easily soluble in water, insoluble in alcohol and decomposed by heating.
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