| 摘要 |
PURPOSE:To manufacture floating expandable sodium percarbonate having superior solubility at low temp. by adding a specified percentage of a nonionic surfactant to powdered sodium percarbonate, mixing them, and heating the mixture at a specified temp. CONSTITUTION:To sodium percarbonate powder of >=100 mesh grain size is added 0.01-0.5wt% nonionic surfactant, they are mixed, and the mixture is heat- treated at 80-140 deg.C to obtain floating expandable sodium percarbonate. Said sodium percarbonate powder used is prepd. by continuously feeding sodium carbonate and an aqueous soln. of hydrogen peroxide to mother liquor contg. sodium carbonate, water and hydrogen peroxide or further contg. a stabilizer such as sodium chloride. Said nonionic surfactant is an adduct of >=5mol 8-22C straight or branched chain higher alcohol to ethylene oxide. |
