A continuous production method and device for preparing granular trans isoprene rubber

Abstract

The invention relates to a continuous production method and device for preparing granular trans-isoprene rubber. The production method comprises the steps of pre-polymerization and polymerization. Polymerized materials are centrifuged to realize preliminary solid-liquid separation, and then dried; a plurality of polymerized materials belonging to the same catalyst system are blended to realize granulation. The continuous production method and device for preparing the granular trans-isoprene rubber have the advantages of no solvent, no low-temperature pre-polymerization, no dust pollution, and stable and uniform product quality, the degree of automation is greatly improved, the monomer conversion efficiency and the production efficiency are improved, the cost of raw materials is reduced, unreacted raw materials are directly conveyed to a transfer device to be recycled without separation, the recycling cost is low, the recycling is easy to realize, the production cost is reduced, the product quality is improved, the trans-content of the prepared trans-isoprene rubber is more than 99 percent, and requirements of users at home and abroad can be met.

Description

technical field [0001] The invention relates to a continuous production method and device for preparing granular trans isoprene rubber. Background technique [0002] The synthesis of trans isoprene rubber has been patented and reported since the 1950s. From the 1960s to the 1980s, Canada, the United Kingdom, Japan, Russia and other countries successively built pilot plants. However, at that time, because the production methods of trans-isoprene rubber used vanadium or vanadium / titanium mixed system as catalyst, in aromatic hydrocarbon or aliphatic solvent For solution polymerization, the catalyst activity is low, the glue viscosity is high, a large amount of solvent needs to be recovered and refined, and the polymer needs to be repeatedly post-treated to remove catalyst residues, etc. The process flow is complicated, energy consumption and material consumption are high, and the scale of the device is relatively large. Small, so the production cost is high, limiting the deve...

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Problems solved by technology

From the 1960s to the 1980s, Canada, the United Kingdom, Japan, Russia and other countries successively built pilot plants. However, at that time, because the production methods of trans-isoprene rubber used vanadium or vanadium / titanium mixed system as catalyst, in aromatic hydrocarbon or aliphatic solvent For solution polymerization, the catalyst activity is low, the glue viscosity is high, a large amount of solvent needs to be recovered and refined, and the polymer needs to be repeatedly post-treated to remove catalyst residues, etc. The process flow is complicated, energy consumption and material consumption are high, and the scale of the device is relatively large. Small and thus high cost of production, limiting the growth of the trans-isoprene rubber market

[0005] 1) One prepolymerization kettle corresponds to one polymerization kettle, and continuous production cannot be realized. The catalytic active center and concentration of different batches of prepolymerization kettles will be different. At the same time, the temperature is lowered in batches, and it must be discharged in a batch of prepolymerization kettles. After that, the next batch of cooling and repeated cycle process will be carried out, and there will be a lot of energy consumption problems

[0006] 2) The product is powdery, low density, strong crystallinity, easy to agglomerate, easy to cause environmental pollution during transportation, packaging and use; and the uniformity of Mooney viscosity distribution of different batches of powdery products is poor, so it is used by downstream customers The process summary is easy to cause unstable product quality. At the same time, it is more difficult to plasticize during the processing. When the powdery product enters the internal mixer, it will stick to the inner wall of the cavity and the discharge port, and it will adhere to the mixing after the glue is discharged. Adhesive surface, forming product defects

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