Method for controlling viscosity of molybdenum-based catalytic butadiene polymerization system

[0036] 1. Preparation of molybdenum-based catalysts

[0037] Preparation of the main catalyst: In the reaction flask after deoxidation and water removal, under the protection of nitrogen, sequentially add molybdenum pentachloride, tributyl phosphate TBP, n-hexane solution, wherein TBP and MoCl 5 The molar ratio of the catalyst is 2:1, and the catalyst is reacted at room temperature for 12 hours.

[0038] Preparation of the co-catalyst: under the protection of nitrogen, m-cresol was added to triisobutylaluminum, and m-cresol and triisobutylaluminum were reacted at a molar ratio of 3:1 for 6 hours.

[0039] 2. Preparation of low-viscosity high-vinyl polybutadiene glue

[0040] The experiment was carried out in a polymerization kettle with a volume of 500L. The catalytic system uses tributyl phosphate (TBP) as ligand, MoCl 5 Main catalyst, m-cresol aluminum as co-catalyst to illustrate:

[0041] (1) The 500L polymerization kettle is purged with nitrogen, replaced and airtight qu

[0050] The preparation method of embodiment 2-5 is the same as that of embodiment 1, the difference is: according to butadiene adding mass 0, 2, 3, 4% dosage is added structural modifier, carries out butadiene polymerization test, analysis and detection embodiment 1-5 Viscosity of the polymerization system.

[0051] Table 1 embodiment 1~5 polymerization system viscosity test result

[0052] Numbering W(structure modifier) / % Viscosity / (mPa*s) Example 2 0 8.00×10 4