METHOD OF PRODUCING POLYSULPHIDE POLYMER Russian patent published in 2012 - IPC C08G75/00 C08G75/16 

FIELD: chemistry.

SUBSTANCE: method involves single-step synthesis by reacting chlorine-containing monomers with sodium hydrosulphide and sulphur in the presence of a quaternary ammonium halide, followed by washing and drying the coagulum to obtain a polysulphide polymer, and after washing the coagulum, alkaline waste water containing sodium hydrosulphide and low-molecular weight polysulphide polymer is sent for recycling. Multi-step synthesis of the polysulphide polymer is simultaneously carried out via polycondensation of di- and polyhalides with sodium tetrasulphide in the presence of a dispersant, wherein the obtained dispersion of the high-molecular weight polysulphide polymer is washed with water and split using sodium sulphite and the recycled alkaline waste water from the single-step synthesis, containing sodium hydrosulphide and low-molecular weight polysulphide polymer; the split dispersion then undergoes coagulation, and the coagulum obtained via the multi-step synthesis is washed, purified and re-washed and the dried together with the coagulum washed after the single-step synthesis of the polysulphide polymer, and the effluent of weakly concentrated water after washing, coagulation and purification during multi-step synthesis is sent for recycling.

EFFECT: reduced cost of polysulphide polymer and low contamination level.

2 cl, 1 dwg, 1 ex