Method for preparing semi-batch emulsifying emulsion of diene rubber latex, rubber latex produced thereby, and graft copolymer prepared therefrom

摘要

The present invention relates to a semi-batch production method of diene rubber latex. The process of the present invention comprises the steps of (a) providing an initial liquid batch composition (including water, emulsifier and diene monomer) in an amount sufficient to occupy 50 to 80 volume percent of the pressure reaction vessel, based on the total vessel volume, ( b) feeding a liquid feed composition comprising a diene monomer and an initiator into a vessel, (c) providing a cooled state to the vessel to cool the liquid and vapor in the vessel, and (d) the total diene used in the reaction. Reacting the diene monomer until at least 80 mol% of the final diene monomer is converted, based on the moles of monomer, such that the final liquid volume level in the vessel is at least 80 volume% based on the total vessel volume. . The process of the present invention provides an efficient liquid phase cooling state during latex formation in the process by enabling a high initial reaction rate that peaks at the beginning of the process when efficient gas phase cooling is at its maximum and maintains a low latex viscosity throughout the process. The process of the present invention can provide higher yields compared to batch processes using the same vessel capacity. The present invention also provides a rubber latex-diene rubber graft copolymer having a particular particle size distribution and rubber latex.