الاستاذ meddgt هذه رسالة مهندس محمود
اهلا بك - اقرأ هذه التجربه المعمليه وحورها بما يتناسب معك
silicone oil of a viscosity of 350 mPas at 25° C., 25 kg of nonylphenolopolyglycol ether with a polyglycol chain containing 14 ethylene oxide groups, and 25 kg of nonylphenolpolyglycol ether with a polyglycol chain containing 3 ethylene oxide groups, are placed in an agitation vessel with a net capacity of 1,000 liters. This mixture is thoroughly mixed using a toothed attrition mill at a peripheral speed of 21 m/s and for 15 minutes. The ratio of the diameter of the toothed attrition mill to the diameter of the vessel is 0.33. Then the 600 kg of water required for emulsification are added at a rate of 10 l/min under the stirring conditions cited above. First, a highly viscous emulsion of the water-in-oil type is obtained, which, after about 400 liters of water have been added, turns into a low-viscosity oil-in-water emulsion. After the entire quantity of water has been added, the emulsion is stirred to completion for another 10 minutes. After shutting off the agitator, the emulsion is finally homogenized by being passed once through a high pressure homogenizer (Manton Gaulin M3) at a pressure of 350 kg/cm2. The finished emulsion contains about 35% by weight of silicone oil.