Emulsification system and preparation process of artificial isoprene rubber latex using rare earth polyisoprene rubber

Using rare earth polyisoprene rubber from Xinjiang Tianli Petrochemical as raw material, artificial isoprene rubber latex was prepared by shear emulsification, distillation desolventization, centri- fugal concentration, and pH value adjustment processes, and its emulsification system and preparation process were studied. The results showed that the emulsion system for preparing artificial isoprene rubber latex was mainly composed of potassium disproportionate rosin and potassium stearate as emulsifiers, Span 80 as a co-emulsifier, pH value range of 9-10, oil and water mass ratio of 5/5, and emulsifier mass fraction of 2.2% of the total material. When using the two-stage method of reverse phase pre-emulsification and shear emulsification for shear emulsification, the most stable gel was obtained by shearing for 10 min at a speed of 3 500 r/min. The series connection of continuous atmospheric distillation kettle and intermittent vacuum distillation kettle could effectively remove solvents. Under the condition of centrifugation at a speed of 3 000 r/min for 15 min at room temperature, an artificial latex with a solid mass fraction of 60% could be obtained, and its performance met the product specifications of Kraton IRL from the United States.