| 摘要 |
PURPOSE:To readily obtain the subject fine particles for a coagulant, etc., at a low cost by supplying an acrylamide aqueous solution on an endless substrate in a state of a thin layer, irradiating radioactive rays for aqueous solution polymerization, forming the produced polymer into fine particles, mixing the resultant particles with causic alkali powder and then drying the mixture. CONSTITUTION:An aqueous solution of acrylamide with 35-50wt.% concentration is supplied onto an endless substrate in a state of a thin layer in an atmosphere ot an inert gas and subjected to aqueous solution polymerization at <=80 deg.C maximum temperature of the polymerization system by irradiation of ultraviolet rays while a liquid coolant is blown on the back surface of the endless substrate for cooling. The resultant acrylamide-based polymer gel with 5-15mm thickness produced in a state of a layer is mixed with causic alkali powder with <=0.5-2m/m particle size under stirring and the mixture is kept within a temperature range raised by heat of hydration and heat of solution for 10-60min. followed by drying to <=10wt.% water content using hot air at 80-100 deg.C. Thereby the objective polymer fine particles are obtained. |
