Polycarbonate preparation system

Abstract

The invention discloses a polycarbonate preparation system which solves the problem that environment stress is increased as cleaning needs a great number of aromatic hydroxyl compounds. According to the technical scheme adopted by the invention, the key point is that the system comprises a polycondensation reaction mechanism, an additive adding mechanism, a mixing filtering mechanism and an extruding pelletizing mechanism; a phenol cleaning mechanism is further connected between the polycondensation reaction mechanism and the extruding pelletizing mechanism; the phenol cleaning mechanism comprises a phenol recycling tank connected between a melt filter and the extruding pelletizing mechanism; a heating device is arranged on the bottom of the phenol recycling tank; the phenol recycling tank is connected between a polycondensation reactor and a static mixer through a cooling pipeline; and a first booster ump is arranged on the cooling pipeline. The polycarbonate preparation system avoids waste of phenol, increases a utilization rate of phenol, and reduces pressure, caused on environment, of waste liquor generated by cleaning equipment.

Description

technical field [0001] The invention relates to polymer materials, in particular to a polycarbonate preparation system. Background technique [0002] Polycarbonate (polycarbonate, PC) is a thermoplastic engineering plastic with excellent performance. It has outstanding impact resistance, creep resistance, good dimensional stability, heat resistance, low water absorption, non-toxicity, and excellent dielectric properties. It is the only product with good transparency among the top five engineering plastics, and it is also the general-purpose engineering plastic with the fastest growth rate in recent years. It can be applied to glass plates, automotive supplies, electrical appliances, optical products, etc., and its market demand is increasing. At present, most manufacturers in the world generally adopt interfacial polycondensation or melt transesterification. [0003] Unlike general polymers, polycarbonate is sensitive to shear due to its special structure. The shearing act...

AI Technical Summary

Problems solved by technology

Since the hydroxyl group is a polar group, it is easy to have an adhesion effect with the metal. Considering the high viscosity of the polycarbonate melt itself, the material stays in the pipeline for a long time, and is prone to local degradation in the eddy current and dead corner areas of the pipeline, resulting in quality degradation , and the polycarbonate that stays in the dead corner for a long time will be cracked and carbonized, which will pollute the product and cause carbon accumulation inside the system, reduce the heat transfer effect of equipment and pipelines, and affect production efficiency and product quality

[0005] For this reason, the pipeline and the equipment used in the preparation of polycarbonate need to be cleaned regularly. Generally, the cleaning liquid is an aromatic monohydroxy compound, but because cleaning requires a large amount of aromatic hydroxyl compounds, the hydroxyl compounds in the cleaning liquid can only be used as waste liquid treatment , thereby increasing the pressure on the environment

Images