A production method for continuous production of high-viscosity polymer

Abstract

The invention relates to the field of polymer production, and discloses a production method for continuous production of high-viscosity polymers, comprising: continuously feeding a prepolymer melt with an intrinsic viscosity of 0.10 to 0.45 dL / g into a final polycondensation reactor, The temperature is 220-295°C, and the absolute pressure is 20-2000Pa, and the reaction stays for 30-250min to prepare a high-viscosity polymer with an intrinsic viscosity of 0.7-1.15dL / g; in the final polycondensation reactor, the prepolymer melt It is successively processed by the first agitator and the second agitator with different rotating speeds. In the present invention, two agitators with different rotation speeds and different structures are arranged in the same polycondensation reactor, so that the polymer can still efficiently renew the liquid film at a higher viscosity, effectively improving the mixing and mass transfer effect at high viscosity, and can Effectively increase the intrinsic viscosity of the polymer at the outlet of the reactor, and effectively improve the production capacity and product range of the polycondensation reactor.

Description

technical field [0001] The invention relates to the field of polymer production, in particular to a production method for continuous production of high-viscosity polymers. Background technique [0002] The current production and preparation of polyethylene terephthalate (PTT), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), butylene terephthalate adipate In the final polycondensation reactor for polyesters such as alcohol ester (PBAT) and polybutylene succinate (PBS), the final polycondensation reactor is the key equipment in the entire production line, and is the final polycondensation reactor for polyester polymerization. Disk reactors and cage-frame reactors are now widely used. In most existing reactors, the viscosity of materials after polycondensation can reach 0.62~0.7dl / g. With the continuous development of new products, the viscosity of the materials after polycondensation in the reactor is required to reach 0.95 dl / g or even higher. The tradi...

AI Technical Summary

Problems solved by technology

On the other hand, when the polymer liquid film and the annular disc form a whole to rotate together, the flow of the subsequent polymer is blocked, and the surface renewal and polymerization reaction of the subsequent polymer are also restricted, so that the viscosity of the subsequent polymer cannot be further increased.

Therefore, when using the traditional disc reactor to produce polymers with higher viscosity, we can only add another set of viscosifying reactors, which makes the production process longer, and the residence time of the polymer at high temperature is prolonged, which affects the quality of the final product. quality, increased investment costs and production costs

Images