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A kind of modified polyester and preparation method thereof

A technology for modifying polyester and polyester, applied in the field of polyester, can solve the problems of poor thermal stability of PEG, yellow hue, poor thermal stability of cationic polyester, etc., and achieve improved thermal stability, low carboxyl end groups, and good hue. Effect

Active Publication Date: 2021-08-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the poor thermal stability of PEG, PEG usually begins to decompose at 150°C, while the polycondensation temperature of polyester is usually around 280°C, so this kind of cationic polyester with PEG as a modified tetramer has poor thermal stability and yellowish hue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 350 grams of terephthalic acid, 220 grams of ethylene glycol, 0.15 grams of ethylene glycol antimony were added to a 2L reactor, the esterification temperature was 200°C to 260°C, and the esterification pressure (gauge pressure) was 2.5MPa butyrate After the water output reaches the theoretical value, end the esterification, vent to normal pressure, add 0.0261 grams of phosphoric acid, cationic three monomer SIPE solution (the ethylene glycol esterification solution of SIPM, SIPE concentration 40%) 28.2 grams, PCL10. 6 grams (molecular weight 500), continue to stir for 10 minutes, gradually decompress and heat up to 270°C within 40min~50min, enter the high vacuum polycondensation stage (gauge pressure<100Pa), polycondensation temperature 270°C~290°C, stirring power reaches rated When the value is reached, the glass transition temperature of the synthesized modified polyester is 71.3°C, the intrinsic viscosity is 0.522dL / g, the terminal carboxyl group is 28mol / ...

Embodiment 2

[0023] Example 2: Add 350 grams of terephthalic acid, 220 grams of ethylene glycol, 0.15 grams of ethylene glycol antimony in a 2L reactor, esterification temperature of 200°C to 260°C, esterification pressure (gauge pressure) of 2.5MPa butyrate After the water output reaches the theoretical value, end the esterification, vent to normal pressure, add 0.0369 grams of trimethyl phosphate, cationic three monomer SIPE solution (ethylene glycol esterification solution of SIPM, SIPE concentration 40%) 56.4 grams , PCL22.3 grams (molecular weight 6000), after continuing to stir for 10 minutes, gradually depressurize and heat up to 270°C within 40min to 50min, enter the high vacuum polycondensation stage (gauge pressure<100Pa), polycondensation temperature 270°C to 290°C, stir When the power reaches the rated value, the glass transition temperature of the synthesized modified polyester is 64.3°C, the intrinsic viscosity is 0.542dL / g, the carboxyl group is 32mol / t, and the color value (...

Embodiment 3

[0024] Example 3: 350 grams of terephthalic acid, 220 grams of ethylene glycol, 0.15 grams of ethylene glycol antimony were added to a 2L reactor, the esterification temperature was 200°C to 260°C, and the esterification pressure (gauge pressure) was 2.5MPa butyrate After the water output reaches the theoretical value, end the esterification, vent to normal pressure, add 0.065 grams of triphenyl phosphate, cationic three monomer SIPE solution (ethylene glycol esterification solution of SIPM, SIPE concentration 40%) 42.3 grams , PCL16.5g (molecular weight 3000), continue to stir for 10 minutes, gradually depressurize and heat up to 270°C within 40min~50min, enter the high vacuum polycondensation stage (gauge pressure<100Pa), polycondensate temperature 270°C~290°C, stir When the power reaches the rated value, the material is discharged. The glass transition temperature of the synthesized modified polyester is 68.0°C, the intrinsic viscosity is 0.530dL / g, the carboxyl group is 30m...

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Abstract

The invention discloses a modified polyester and a preparation method thereof. The polyester is subjected to esterification reaction with terephthalic acid, ethylene glycol and a catalyst as raw materials. When the water output reaches the theoretical amount, the esterification is terminated; the pressure is released At normal pressure, add cationic trimonomer, polycaprolactone diol and stabilizer, stir for more than 10 minutes, carry out polycondensation reaction, and discharge after the stirring current reaches the rated value, and then the normal pressure dyeable cationic polyester can be prepared. The present invention uses polycaprolactone dihydric alcohol (PCL) as four monomers to replace the commonly used polyethylene glycol, because the heat stability of PCL obviously improves than PEG, therefore uses PCL as the cationic copolyester prepared by four monomers The thermal stability is significantly improved, which solves the disadvantage of poor thermal stability of cationic dyeable polyester prepared by conventional methods. This cationic dyeable polyester fiber is not only dyeable under normal pressure, but also has good hue and low terminal carboxyl group.

Description

technical field [0001] The invention relates to the field of polyester, in particular to a modified polyester and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is widely used in various fields of production and life. Due to the low price and high quality of polyester fiber, polyester fiber has the fastest development speed among the three major synthetic fibers and has become the world's largest fabric fiber. . PET is a symmetrical linear macromolecule, the molecular chain does not contain side chain groups, and the regularity is very good. The glass transition temperature of PET is high, and polyester fiber needs to be dyed at high temperature to promote the diffusion of dye molecules into the fiber; secondly, there is no polar group on the PET molecular chain that can interact with dye molecules, making it difficult to dye the fiber. The deep dyeing effect of conventional polyester fiber is not good, and the dyeing is not br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/86D01F6/84D06P1/00D06P3/52
CPCC08G63/6886C08G63/866D01F6/84D06P1/00D06P3/52
Inventor 戴志彬陈海燕夏峰伟周倩常玉
Owner CHINA PETROLEUM & CHEM CORP