Preparation process of polycarbonate

Abstract

The invention relates to a preparation process of polycarbonate. The preparation process comprises the following steps: (S1) respectively fusing the substances respectively in formula 1 (shown in the description) and formula 2 (shown in the description) so as to obtain melts, adding the melts into an ester exchange reactor, and adding a catalyst to generate ester exchange reaction, so as to obtain an oligomer; (S2) adding the oligomer obtained in the step (S1) into a condensation polymerization reactor to generate condensation polymerization, so as to obtain a condensation polymerization product; and (S3) adding the condensation polymerization product obtained in the step (S2) into an extruding machine, carrying out extruding, water-bath cooling and drying, conveying the condensation polymerization product to a granulator, and carrying out shear granulation, so as to obtain finished polycarbonate particles, wherein R represents a naphthenic base, and R' and R'' represent alkyl or phenyl. By utilizing the above technical scheme, bisphenol Z-series polycarbonate is prepared in a melting manner, so that the use of a large number of solvents is saved, the resources are saved, and excessive environmental pollution is unlikely to be caused.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a preparation process of polycarbonate. Background technique [0002] Polycarbonate (referred to as PC) is a high molecular polymer containing carbonate groups in its molecular chain. Due to its special structure, it has become the fastest-growing general-purpose engineering plastic among the five major engineering plastics. At the same time, according to the structure of the ester group, it can be divided into various types such as aliphatic, aromatic, and aliphatic-aromatic. 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. In particular, bisphenol A polycarbonate has the advantages of good mechanical strength, excellent heat resistance and high impact strength, and its preparation process is relatively mature, s...

AI Technical Summary

Problems solved by technology

However, in the whole preparation process, a large amount of alkali and halogenated alkanes are needed as solvents, which will easily cause a large amount of waste of resources and environmental pollution in the production process.

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