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Continuous polymerization preparation method of fast crystallized and flame-retardant PET (Polyethylene Terephthalate) copolymer

A copolymer and crystallization technology, which is applied in the continuous polymerization preparation of flame-retardant PET copolymers and in the field of fast crystallization, can solve the problems that flame-retardant copolymers do not have fast crystallization, and achieve fast injection molding, fast crystallization speed, and high mechanical strength Effect

Active Publication Date: 2014-09-10
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent application 201210545807.4 provides a method for continuous polymerization of flame-retardant polyester copolymers, but flame-retardant copolymers do not have the characteristics of fast crystallization, and fast crystallization modification is required if injection molding is to be performed

Method used

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  • Continuous polymerization preparation method of fast crystallized and flame-retardant PET (Polyethylene Terephthalate) copolymer
  • Continuous polymerization preparation method of fast crystallized and flame-retardant PET (Polyethylene Terephthalate) copolymer
  • Continuous polymerization preparation method of fast crystallized and flame-retardant PET (Polyethylene Terephthalate) copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Put terephthalic acid and ethylene glycol into the beating kettle with a molar ratio of 1:1.15 in the continuous polyester polycondensation production device of small flexible modified polyester with a daily output of 5 tons, and add nucleating agent 4000 mesh talcum powder at the same time Beating together, the beating time is 40 minutes, put into the slurry supply tank 1 after the beating is finished; the addition amount of the nucleating agent is 0.5% of the total mass of terephthalic acid and ethylene glycol;

[0057] 2. Pump the slurry obtained in step 1 into the first esterification reaction kettle to carry out the esterification reaction, and the esterification temperature is 258° C.; control the flow rate so that the esterification rate reaches 92% after passing through the first esterification reaction kettle; Into the pipeline, through the syringe 1 and syringe 2 in turn;

[0058] 3. Melt PEG with a molecular weight of 1000 in a melting tank at a melting te...

Embodiment 2

[0064] 1. Put terephthalic acid and ethylene glycol into the beating kettle with a molar ratio of 1:1.15 on the small flexible modified polyester continuous polyester polycondensation production plant with a daily output of 5 tons, and add nucleating agent 6000 mesh talcum powder at the same time Beating together, the beating time is 50 minutes, put into the slurry supply tank 1 after the beating is finished; the addition amount of the nucleating agent is 0.3% of the total mass of terephthalic acid and ethylene glycol;

[0065] 2. Pump the slurry obtained in step 1 into the first esterification reaction tank to carry out the esterification reaction. The esterification temperature is 265° C., and the flow rate is controlled so that the esterification rate reaches 91% after passing through the first esterification tank; Into the pipeline, through the syringe 1 and syringe 2 in turn;

[0066] 3. Melt PEG with a molecular weight of 2000 in a melting tank at a melting temperature o...

Embodiment 3

[0072] 1. Put terephthalic acid and ethylene glycol into the beating kettle at a molar ratio of 1:1.15 on the small flexible modified polyester continuous polyester polycondensation production plant with a daily output of 5 tons, and add nucleating agent 5000 mesh talcum powder at the same time Beating together, the beating time is 35 minutes, put into the slurry supply tank 1 after the beating is finished; the addition amount of the nucleating agent is 0.4% of the total mass of terephthalic acid and ethylene glycol;

[0073] 2. Pump the slurry obtained in step 1 into the first esterification reaction tank to carry out the esterification reaction. The esterification temperature is 255° C., and the flow rate is controlled so that the esterification rate reaches 91% after passing through the first esterification tank; Into the pipeline, through the syringe 1 and syringe 2 in turn;

[0074] 3. Melt PEG with a molecular weight of 800 in a melting tank at a melting temperature of 7...

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Abstract

The invention relates to the field of PET (Polyethylene Terephthalate) copolymer and particularly relates to a continuous polymerization preparation method of a fast crystallized and flame-retardant PET copolymer. On a continuous polymerization production line of flexible modified polyester, the fast crystallized and flame-retardant PET copolymer is continuously prepared by a novel short-flow continuous polymerization device comprising an esterification kettle, a pre-shrinking kettle and a final polycondensation kettle. The method has the advantages of low energy consumption in the preparation process, high yield and good stability of the quality, the large-scale industrial production is achieved and the products have strong market competitiveness.

Description

technical field [0001] The invention relates to the field of PET copolymers, in particular to a continuous polymerization preparation method of fast crystallization and flame-retardant PET copolymers. Background technique [0002] Due to its special structure and excellent physical and chemical properties, polyester has been widely used in textiles, films and other fields. Due to the relatively strong rigidity of the polyester molecular chain, when it is used as an engineering plastic, the molding crystallization is relatively slow, and it is not easy to shape. In order to improve this, it is often necessary to add a crystal nucleating agent and a nucleating accelerator, such as CN201310239570.1, preparation The process is cumbersome and the cost is relatively high. Often limit its wide application in the field of engineering plastics. [0003] Polyester fibers such as PET are flammable polymer materials. As engineering plastics, they are required to have good flame retard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/692C08G63/78C08K3/34
Inventor 刘伯林金剑
Owner CHINESE TEXTILE ACAD
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