Dear Shubham Kailas Chaudhari , for preparing pre emulsion first you need to weight exact amount of each monomer, but before feeding them in monomer vessel you should prepare the emulsifier in different vessel. It might be needed to increase temperature for dissolving them, when the solution is prepared you should cool it and feed it to the monomer tank which is equipped with stirrer, but at this stage the RPM should not very high. Now with stirrer on, you can add monomers. It is important to find best emulsifier for this purpose.