The invention adopts a direct coagulation method for preparation of a high performance butadiene-
styrene-
isoprene powder polymer. The method comprises the following steps: dispersion of a
carbon nanotube: a step of adding the
carbon nanotube and water into a high-speed
disperser and carrying out stirring to allow the
carbon nanotube to be uniformly dispersed; preparation of graft latex: a step of successively adding water,
styrene-butadiene latex, an emulsifier and a molecular weight
regulator into a
polymerization kettle, carrying out
nitrogen displacement, adding
isoprene, carrying out stirring and heating, adding an initiator and carrying out
polymerization to prepare the graft latex; and coagulation for formation of
powder: a step of successively adding the graft latex, water and the carbon
nanotube into a coagulation kettle, carrying out stirring and heating, adding a
release agent, a flocculating agent and a coagulating agent and carrying out curing, washing,
dehydration and
drying to obtain the
powder polymer. The prepared powder
polymer has the following performances: a powder particle size of 0.5 to 0.8 mm;
isoprene content in PSBIR of 20 to 40%;
Mooney viscosity ML(1+4)<100 DEG C> of 50 to 70; 300% stress at definite elongation of 18 to 25 MPa; tensile strength of no less than 27.0 MPa; elongation at break of no less than 560%; antistatic resistance of 106 to 109
omega; and electrization
voltage of less than 100V.