Method for continuously polymerizing chain extension modified polyester

A technology of modified polyester and chain extender, applied in the field of preparing modified polyester by chain extension method, can solve the problems of high cost, poor product quality stability, low production efficiency, etc., and achieve stable quality, excellent thermal stability, good uniformity

Active Publication Date: 2014-04-30
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the current chain-extended modified polyester is usually prepared by reactive extrusion in a screw extruder, the production efficiency is low, the cost is high, and the quality stability of the product is poor

Method used

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  • Method for continuously polymerizing chain extension modified polyester
  • Method for continuously polymerizing chain extension modified polyester
  • Method for continuously polymerizing chain extension modified polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) The polyethylene terephthalate melt with an intrinsic viscosity of 0.67dl / g is directly transported from the polycondensation system to the melt pipeline by the melt metering gear pump, and the temperature of the melt pipeline is 285°C;

[0060] (2) The hexamethylene diisocyanate in the chain extender supply tank is accurately metered by the chain extender metering screw pump, and then injected into the melt pipeline by a high-pressure syringe, and the injection flow is measured according to the melt metering gear pump. Polyethylene terephthalate The flow ratio control of the alcohol ester melt, the injection amount is 0.01wt% of the melt mass;

[0061] (3) The chain extender injected into the melt pipeline enters the dynamic mixer together with the polyethylene terephthalate melt, and the temperature of the dynamic mixer is 285°C;

[0062] (4) After being uniformly mixed by a dynamic mixer, enter the homogenizer to carry out chain extension homogenization reaction ...

Embodiment 2

[0065] (1) The polybutylene terephthalate melt with an intrinsic viscosity of 0.80dl / g is directly transported from the polycondensation system to the melt pipeline by the melt metering gear pump, and the temperature of the melt pipeline is 250°C;

[0066] (2) The toluene diisocyanate in the chain extender supply tank is accurately metered by the chain extender metering screw pump, and then injected into the melt pipeline by a high-pressure injector, and the injection flow is measured according to the melt metering gear pump for polybutylene terephthalate melt. The flow ratio of the melt is controlled, and the injection amount is 0.05wt% of the melt mass;

[0067] (3) The chain extender injected into the melt pipeline enters the dynamic mixer together with the butylene terephthalate melt, and the temperature of the dynamic mixer is 250°C;

[0068] (4) After being uniformly mixed by a dynamic mixer, enter the homogenizer to carry out chain extension homogenization reaction in t...

Embodiment 3

[0071] (1) Polytrimethylene terephthalate melt with an intrinsic viscosity of 0.78dl / g is directly transported from the polycondensation system to the melt pipeline by the melt metering gear pump, and the temperature of the melt pipeline is 230°C;

[0072] (2) The diphenylmethane diisocyanate in the chain extender supply tank is accurately metered by the chain extender metering screw pump and then injected into the melt pipeline by a high-pressure syringe, and the injection flow is measured according to the melt metering gear pump for polypropylene terephthalate The flow ratio of the melt is controlled, and the injection amount is 0.6wt% of the mass of the melt;

[0073] (3) The chain extender injected into the melt pipeline enters the dynamic mixer together with the polypropylene terephthalate melt, and the temperature of the dynamic mixer is 230°C;

[0074] (4) After being uniformly mixed by a dynamic mixer, it enters a homogenizer to carry out chain extension homogenization...

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Abstract

The invention relates to a method for continuously polymerizing chain extension modified polyester. The method mainly comprises the following steps of directly conveying polyester melt from a condensation polymerization system by a melt metering gear pump to a melt pipeline, then allowing the polyester melt and the chain extender injected into the melt pipeline by a chain extender injection device to enter a dynamic mixer, after mixing uniformly by the dynamic mixer, entering a homogenizer for chain extension homogenizing reaction so as to obtain the chain extension modified polyester melt, filtering the obtained melt by a melt filter, then transferring the filtered melt to a casting belt head for cooling and curing, and finally, pelletizing by a pelletizer so as to obtain chain extension modified polyester chips. The method for continuously polymerizing chain extension modified polyester guarantees the stability of the product quality, improves production efficiency, lowers production cost, and realizes large scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing modified polyester by chain extension, in particular to a method for continuous polymerization of chain extension modified polyester. Background technique [0002] Polyester is a kind of thermoplastic crystalline polymer with excellent fiber-forming properties, creep resistance, wear resistance, heat resistance, corrosion resistance, electrical insulation and mechanical properties, etc. It is used in fiber, packaging, engineering Plastics, medical materials and other fields have been widely used. In recent years, due to the rapid increase in the demand for polyester industrial yarn, polyester film and polyester engineering plastics, a large amount of high molecular weight polyester resin is urgently required. [0003] At present, there are two main methods for industrial production of high molecular weight polyester: (1) using bulk melt polymerization to increase the molecular weight by prolonging the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/78
Inventor 邱志成金剑
Owner CHINESE TEXTILE ACAD
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