FIELD: chemistry.
SUBSTANCE: method for preparation of a dilithium initiator for anionic (co)polymerization based on the olefin-aromatic hydrocarbon and conjugated diene oligomer, with the general formula Li-B-A-B-Li, where Li is the active center, B is the diene unit, A is the olefin-aromatic unit. Lithium metal dispersion in a non-polar solvent (NPS) is reacted with a mixture of a polar (PS) and a nonpolar (NPS) solvent and an olefin-aromatic hydrocarbon (OAH). The mixture has the ratio of OAH:PR:CPD = 1:a:b, where a is 1.3 - 2, b is 3 - 4. A OAH-PS-NPS are added simultaneously to the lithium metal dispersion in NPS, cooled to a temperature of -10 to +10°C, with continuous stirring at a molar ratio of Li:olefin-aromatic hydrocarbon 1.5:1 to 5:1. The obtained reaction mixture is recooled to -10 to +10°C. Then the conjugated diene is added simultaneously, which is cooled to a temperature of -10 to +10°C, taken at the molar ratio of olefin-aromatic hydrocarbon:conjugated diene 0.3: 1-1.5:1. Dilithium initiator, obtained by the claimed method, is also described.
EFFECT: simplified technology of dilithium initiator production, increased initiatoe stability time without reduction of its activity.
30 cl, 3 tbl, 20 ex
