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
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Authors
Dates
2012-09-20—Published
2011-07-20—Filed