Polycarbonate production system

Abstract

A polycarbonate production system comprises a devolatilization and granulation system. The devolatilization and granulation system comprises a double-screw devolatilization extruder, a granulation machine and a water storage pool. The double-screw devolatilizaiton extruder is communicated with the granulation machine. A particle output opening of the granulation machine is soaked below the liquid level in the water storage pool. In the polycarbonate granulation process, due to the fact that output polycarbonate particles are high in temperature at this moment, a great amount of hydroxyl aryl group reaction products are still volatilized, the volatilized hydroxyl aryl group reaction products can be absorbed while polycarbonate is extruded out by the double-screw devolatilizaiton extruder. The particle output opening of the granulation machine is located below the water surface in the water storage pool, the particles can be shaped quickly under the action of the cooling function of cooling water after being output, meanwhile, ester bond combination in the particles is firmer under the rapid cooling condition, and thus the rigidity of the particles is enhanced; and besides, the cooling water can absorb the hydroxyl aryl group reaction products to prevent the hydroxyl aryl group reaction products from entering the atmosphere.

Description

technical field [0001] The invention relates to the chemical field, in particular to a polycarbonate production system. Background technique [0002] Polycarbonate (referred to as PC) is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into aliphatic, aromatic, aliphatic-aromatic and other types. Among them, the low mechanical properties of aliphatic and aliphatic-aromatic polycarbonates limit their application in engineering plastics. At present, only aromatic polycarbonate has been produced industrially. Due to the special structure of polycarbonate, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics. [0003] For example, the Chinese patent "Manufacturing Method of Polycarbonate and Polycarbonate Particles" with application number 201280016769.1 discloses a method for manufacturing polycarbonate. In this invention, a s...

AI Technical Summary

Problems solved by technology

[0003] For example, the Chinese patent "Manufacturing Method of Polycarbonate and Polycarbonate Particles" with application number 201280016769.1 discloses a method for manufacturing polycarbonate. In this invention, a specific dihydroxy compound with a -CH2-O- structure is used as Raw material manufactures polycarbonate, and its heat stability is low compared with the bisphenols used as the raw material of polycarbonate in the past, can solve a plurality of problems as mentioned above, the object of the present invention also relates to a kind of manufacturing method, it can quality Stable and high-yield production of polycarbonate with excellent color tone and mechanical properties

[0004] However, the granulation process is mainly carried out in a normal atmospheric environment, so a large amount of hydroxyaryl reaction products are often emitted into the atmosphere, thus causing serious environmental pollution and causing serious harm to the health of the staff.

Images