Adjustment method for molecular weight distribution of rare-earth isoprene rubber
A technology of molecular mass distribution and adjustment method, which is applied in the field of molecular mass distribution adjustment of rare earth isoprene rubber, can solve the problems of unreported synthesis processing performance, pollution of recovered solvent, and increased burden of solvent recovery unit of production equipment, etc.
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Embodiment 1
[0023] The polymerization device adopts a continuous polymerization device, and the volume of the polymerization tank is 20L. It is a continuous polymerization device with 3 polymerization tanks, and is equipped with a glue tank, a termination tank and a post-processing device (including coagulation, post-processing recovery, extrusion drying, etc.). The feed rate of isoprene was 3.0 L / h, and the feed rate of solvent hexane was 17 L / h. After mixing isoprene and hexane, the temperature reaches 20°C through the preheater, and enters the first polymerization tank at the same time as the rare earth catalyst. The feed amount of rare earth catalyst is:
[0024] Neodymium naphthenate hexane solution: 0.31mol / L, 1.92mmol / h, 6.20ml / h;
[0025] Hexane solution of triethylaluminum: 3.96mol / L, 48.0mmol / h, 12.12ml / h;
[0026] Hexane solution of diisobutyl aluminum chloride: 0.6mol / L, 11.16mmol / h, 18.6ml / h.
[0027] The catalyst neodymium naphthenate and triethylaluminum were mixed by a ...
Embodiment 2
[0029] With embodiment 1, in the catalytic system, neodecanoate replaces neodymium naphthenate, and the feeding amount of rare earth catalyst and operating condition are the same as embodiment 2, and anti-aging agent is changed into 2246, measures the ratio of rare earth isoprene rubber product every two hours. Mooney, molecular mass and its distribution, selected representative samples to measure the cis 1, 4 structure of the product. The cis 1,4 structure content measured by infrared spectrum is 97.0%, the molecular mass distribution curve measured by GPC is a single peak, the number average molecular mass is 610000-840000, and the molecular mass distribution Mw / Mn=1.9-2.8. Mooney viscosity is 82-85 (ML 1+4 100℃ ).
Embodiment 3
[0031] Same as Example 1, in the catalytic system, diethylaluminum hydride replaces triethylaluminum, the feed amount and operating conditions of the rare earth catalyst are the same as in Example 1, the anti-aging agent is changed to 4020, and the rare earth isoprene rubber product is measured every two hours Mooney, molecular mass and its distribution, select representative samples to measure the cis 1,4 structure of the product. The cis 1,4 structure content measured by infrared spectroscopy is 96.8%, and the molecular mass distribution curve measured by GPC is a double peak,
[0032] The number average molecular mass is 720000-812000, and the molecular mass distribution Mw / Mn=1.9-2.3. Mooney viscosity is 79-82 (ML 1+4 100℃ ).
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