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Preparation method of high-molecular-weight polycarbonate, and polycarbonate

A technology of polycarbonate and high molecular weight, which is applied in the field of polycarbonate to achieve the effect of reducing branching, narrow molecular weight distribution and uniform molecular weight distribution

Active Publication Date: 2021-12-17
NINGBO ZHETIE DAPHOON CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polycarbonates are usually synthesized by bisphenol A and diphenyl carbonate through transesterification and polycondensation reactions. However, the molecular weight distribution of polycarbonates produced in China is relatively wide, and the maximum average molecular weight is only about 3w.

Method used

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  • Preparation method of high-molecular-weight polycarbonate, and polycarbonate
  • Preparation method of high-molecular-weight polycarbonate, and polycarbonate
  • Preparation method of high-molecular-weight polycarbonate, and polycarbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A kind of preparation method of high molecular weight polycarbonate, adopts above-mentioned preparation system, comprises the following steps:

[0052] ①, mixing preheating:

[0053] Using diphenyl carbonate and bisphenol A as raw materials, potassium bicarbonate as a catalyst, adding 1.06 mol of diphenyl carbonate and 100 μmol of potassium bicarbonate to 1 mol of bisphenol A, adding the above raw materials and catalyst to the mixing tank 4 , control the temperature of the material in the mixing tank 4 to be 80-100°C, mix and preheat for 2-3h to obtain a premix; wherein, the average molecular weight and molecular weight distribution of the polycarbonate prepared at the above preheating temperature and time The difference is small, and this embodiment specifically takes 2.5 hours of mixing and preheating at 90° C. as an example for illustration.

[0054] ②, transesterification:

[0055] The premixed material obtained in step ① is sequentially transported to three tower...

Embodiment 2-4

[0061] Examples 2-4 On the basis of the method in Example 1, the parameters of transesterification, precondensation and final polycondensation were adjusted, and the specific adjustments are shown in Table 1 below.

[0062] Table 1 The reaction parameter table of embodiment 1-4

[0063]

Embodiment 5

[0065] Embodiment 5-6 On the basis of the method of embodiment 1, the temperature and time of mixing preheating are adjusted. Wherein, in Example 5, mixing and preheating at 70° C. for 4 hours; in Example 6, mixing and preheating at 120° C. for 2 hours.

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Abstract

The invention relates to the technical field of polycarbonate, and concretely relates to a preparation method of high-molecular-weight polycarbonate, and the polycarbonate. The preparation method of the high-molecular-weight polycarbonate comprises the following steps: by taking diester carbonate and a dihydroxy compound as raw materials, adding a catalyst, mixing and preheating, and sequentially carrying out ester exchange, pre-polycondensation and final polycondensation reaction under the conditions that the temperature is 210-320 DEG C and the absolute pressure is 0.01-30 kPa. At least three tower type ester exchange reactors which are connected in sequence are adopted for ester exchange, the temperatures of the three tower type ester exchange reactors are gradually increased to 210-240 DEG C, 230-250 DEG C and 245-270 DEG C in sequence, at least one horizontal type pre-polycondensation reactor is adopted for pre-polycondensation, and at least one horizontal type final polycondensation reactor is adopted for final polycondensation. The polycarbonate prepared by the method is relatively narrow in molecular weight distribution, the average molecular weight can reach 4w, and the polycarbonate has relatively high molecular weight.

Description

technical field [0001] The application relates to the technical field of polycarbonate, more specifically, it relates to a preparation method of high molecular weight polycarbonate and polycarbonate. 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, aliphatic and aromatic polycarbonates have excellent mechanical properties and are widely used in the fields of electronic components, automotive components, optical recording media, lenses, and the like. [0003] Molecular weight and its distribution are one of the important parameters to characterize polymers, which have an important impact on the mechanical properties and thermal stability of polymers. Existing polycarbonates are usually synthesized by bisphenol A and diphenyl carbonate through tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCC08G64/307C08G64/305
Inventor 周志峰李兴唐何燕峰董星明施懿军邱琪浩顾亥楠
Owner NINGBO ZHETIE DAPHOON CHEM