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Method for continuously preparing modified polyester

A technology for modifying polyester and polyester, which is applied in the direction of one-component polyester rayon and one-component copolyester rayon, etc., which can solve the problems of poor product uniformity, cost, quality, and output disadvantages. To achieve uniform dispersion, full and more even reaction

Active Publication Date: 2010-06-16
SHANGHAI JUYOU CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a field with a large market demand, the preparation of modified polyester has always been in the batch production stage. Although this method has the advantage of production flexibility, the uniformity of the products produced by it is poor, no matter in terms of cost, quality or There is a clear disadvantage in terms of production

Method used

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  • Method for continuously preparing modified polyester
  • Method for continuously preparing modified polyester
  • Method for continuously preparing modified polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The raw materials terephthalic acid and ethylene glycol are added to the esterification tank at a flow rate of 6250kg / h and 3125kg / h respectively, and the esterification reaction or polymerization reaction is carried out at a temperature of 270 ° C. The average value of the esterification product The degree of polymerization reaches 3, and when the rate of esterification is 91%, the esterification product oligomer that the degree of polymerization is 3 is delivered to a pipeline with a flow rate of 7588kg / h. A flow rate of 455kg / h is injected into ethylene glycol at a temperature of 45°C, and a SIPE solution with a temperature of 100°C and a concentration of 25% is injected at a flow rate of 607kg / h from the pipeline that is closer to the precondensation tank, and the temperature of the pipeline is kept At 230°C and a pressure of 400KPa, the mixture in this pipeline enters the liquid homogenizer to make it evenly mixed, and then flows from the homogenizer to the preconde...

Embodiment 2

[0059] The raw materials terephthalic acid and ethylene glycol are added to the esterification tank at a flow rate of 6250kg / h and 4202kg / h respectively, and the esterification reaction or polymerization reaction is carried out at a temperature of 260°C. The average value of the esterification product When the degree of polymerization reaches 6, the acid value is 40mgKOH / g; The esterification product oligomer that the degree of polymerization is 6 is transported to a pipeline with a flow rate of 7588kg / h, and is passed through the near addition pipeline from this pipeline distance from the esterification kettle to A flow rate of 530kg / h is injected into ethylene glycol at a temperature of 50°C, and a SIPE solution with a temperature of 90°C and a concentration of 20% is injected at a flow rate of 675kg / h from the pipeline that is closer to the precondensation tank, and the temperature of the pipeline is kept At 230°C and a pressure of 500KPa, the mixture in this pipeline enters...

Embodiment 3

[0061] The raw materials terephthalic acid and ethylene glycol are added to the esterification tank at a flow rate of 6250kg / h and 1875kg / h respectively, and the esterification reaction or polymerization reaction is carried out at a temperature of 240°C. The average value of the esterification product The degree of polymerization reaches 8, and when the rate of esterification is 92%, the esterification product oligomer that the degree of polymerization is 8 is delivered to a pipeline with a flow rate of 7588kg / h. The flow rate of 379kg / h injects ethylene glycol with a temperature of 60°C, and the SIPE solution with a temperature of 80°C and a concentration of 15% is injected at a flow rate of 758kg / h from the pipeline that is closer to the precondensation tank, and the temperature of the pipeline is maintained. At 230°C and a pressure of 550KPa, the mixture in the pipeline enters the liquid homogenizer through a high-shear homogenizer pump to make it evenly mixed, and then flow...

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Abstract

The invention relates to a method for continuously preparing modified polyester, comprising the following steps: conveying PET AND EG to an esterification autoclave from a feed port for esterification reaction, so as to obtain terephthalic acid ethylene glycol low polymer; then inputting the low polymer melt to a polycondensation autoclave through a pipeline for polymerization reaction with SIPM or multi-simplexes and addition agent, thus obtaining modified polyester melt and then carrying out granulation or direct spinning; wherein the two ends of the pipeline are respectively connected with the esterification autoclave and the polycondensation autoclave, when the low polymer melt flows through the pipeline, ethylene glycol solution of the SIPM or multi-simplexes and addition agent are added to the pipeline and mixed evenly with the low polymer melt in the pipeline, meanwhile the later-stage esterification reaction is carried out, and the mixture enters the polycondensation autoclave for polymerization reaction. With the method of the invention adopted, continuous industrialized production is realized, production cost is greatly reduced; in addition the SIPM or multi-simplexes with special groups are evenly distributed on the backbone of the polyester, as a result, high quality modified polyester products can be obtained for sure in the later stage.

Description

technical field [0001] The invention relates to a method for preparing various modified polyesters, and specifically designs a method for continuously preparing modified polyesters. Background technique [0002] In recent years, with the gradual increase of polyester modified varieties and the continuous development of preparation technology, the market share of modified polyester products has increased, forming a stable market demand. Among them, the varieties with a large amount mainly include: cationic dye-dyeable polyester, acid dye-dyeable polyester, full-dull polyester, water-soluble polyester, low-melting point polyester, flame-retardant polyester, etc. However, due to the high crystallinity, high degree of orientation and high glass transition temperature of the polyethylene terephthalate (PET) fiber itself, it is difficult to diffuse various dyes or special properties in the presence of no carrier at normal pressure. Into the PET molecule, it brings difficulties to...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/688C08G63/672C08G63/181C08G63/692C08K3/22C08K3/04B29B9/00D01F6/84D01F6/62
Inventor 汪少朋王新良田崇著张翠丽
Owner SHANGHAI JUYOU CHEM ENG
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