| 简介 |
FIELD : chemistry.SUBSTANCE : method involves the polymerization of butadiene in a hydrocarbon solvent medium in the presence of a catalytic complex. The catalytic complex consists of a rare earth metal compound with the serial number 57-71 of the periodic system, an organoaluminium compound, a conjugated diene and a halogen-containing compound. Polymerized butadiene interacts with a modifier, a tin-containing compound. The modifier is fed to the polymerisate upon achievement of the monomer conversion of 87 to 95% and subjected to preliminary intensive mixing with the polymerization stream in a static flow mixer providing a degree of homogenization of, at least, 90%. After that, the resulting solution is further stirred in a subsequent reactor for 0.5-2 hours at a temperature of 62-80°C. At the end, the polymer is isolated and dried.EFFECT : obtaining polybutadiene with a narrow polydispersity, high viscosity according to Mooney and the content of 1, 4-cis units with improved physical-mechanical performance of rubber.20 cl, 2 tbl, 23 ex |
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