Modified polyester and preparation method thereof

A modified polyester and esterification technology, applied in the field of polyester, can solve the problems of low dyeing rate, small increase in free volume, high melt viscosity of PET fibers, etc., to increase the degree of diffusion, increase free volume, The effect of improving dyeing performance

Active Publication Date: 2017-02-08
JIANGSU HENGLI CHEM FIBER
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the molecular chains of PET are regular, the crystallinity is good, the molecular chains are closely arranged, and there are no polar groups that interact with dye molecules on the molecular chains, which makes the coloring of PET fibers more difficult.
[0005] Therefore, the usual PET fiber dyeing is generally under high temperature and high pressure, and disperse dyes are selected for dyeing. W

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modified polyester and preparation method thereof
  • Modified polyester and preparation method thereof
  • Modified polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] A method for preparing modified polyester specifically includes the following steps:

[0043] (1) Preparation of glycol terephthalate:

[0044] A slurry of terephthalic acid and 2-pentyl-1,3 propylene glycol with a molar ratio of 1:1.3 was added to the reactor at a concentration of 50% by weight, and the added amount was 0.3% by weight of terephthalic acid. Under the catalysis of sulfuric acid, the esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurization pressure is normal pressure and the temperature is 180°C. When the amount of water distilled in the esterification reaction reaches 90% of the theoretical value When is the end point of the esterification reaction, the glycol terephthalate is obtained;

[0045] (2) Preparation of ethylene terephthalate:

[0046] The terephthalic acid and ethylene glycol with a molar ratio of 1:1.2 are prepared into a slurry and then added to the reactor fo...

Example Embodiment

[0050] Example 2

[0051] A method for preparing modified polyester specifically includes the following steps:

[0052] (1) Preparation of glycol terephthalate:

[0053] A slurry of terephthalic acid and 2-hexyl-1,3 propylene glycol with a molar ratio of 1:1.38 was added to the reactor at a concentration of 55wt%, and the added amount of concentrated sulfuric acid was 0.32% by weight of terephthalic acid The esterification reaction is carried out under the catalyzed action of, the esterification reaction is pressurized in a nitrogen atmosphere, the pressure is 0.13MPa, the temperature is 181℃, when the amount of water distilled in the esterification reaction reaches 91% of the theoretical value It is the end point of the esterification reaction to obtain the glycol terephthalate ester;

[0054] (2) Preparation of ethylene terephthalate:

[0055] The terephthalic acid and ethylene glycol were prepared into a slurry with a molar ratio of 1:1.3 and then added to the reactor to carry out ...

Example Embodiment

[0059] Example 3

[0060] A method for preparing modified polyester specifically includes the following steps:

[0061] (1) Preparation of glycol terephthalate:

[0062] Prepare a slurry of terephthalic acid and 2-heptyl-1,3 propylene glycol with a molar ratio of 1:1.33 and add it to the reactor at a concentration of 60% by weight and 0.33% by weight of terephthalic acid. Under the catalysis of sulfuric acid, the esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressure is 0.12MPa and the temperature is 183℃. When the amount of water distilled in the esterification reaction reaches 92% of the theoretical value When is the end point of the esterification reaction, the glycol terephthalate is obtained;

[0063] (2) Preparation of ethylene terephthalate:

[0064] The molar ratio of 1:1.31 terephthalic acid and ethylene glycol was prepared into a slurry and then added to the reactor to carry out the esterification reaction. T...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a modified polyester and a preparation method thereof. The modified polyester is composed of a terephthalic acid segment, a glycol segment, and a branch chain containing dihydric alcohol segment. The branch chain of the branch chain containing dihydric alcohol segment is positioned on one non-terminal carbon of the branch chain containing dihydric alcohol segment, is a straight carbon chain, and contains 5 to 10 carbon atoms. The preparation method comprises the following steps: carrying out esterification reactions between terephthalic acid and branch chain containing dihydric alcohol in the presence of concentrated sulfuric acid to obtain dihydric alcohol terephthalate; then carrying out esterification reactions between terephthalic acid and glycol to obtain ethylene terephthalate; stirring and mixing dihydric alcohol terephthalate and ethylene terephthalate, in the presence of a catalyst and a stabilizing agent, and carrying out condensation reactions in a low vacuum stage and a high vacuum stage to obtain modified polyester. The increased space between the gaps among molecular chains in polyester is far greater than that of branch chain free polyester at a same temperature, so small particles such as dye can more easily enter the interior of modified polyester, and the dyeing speed is increased.

Description

technical field [0001] The invention belongs to the technical field of polyester, and relates to a modified polyester and a preparation method thereof. Background technique [0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances such as anti-wrinkle and anti-wrinkle, good stiffness, etc. It is widely used in clothing, home textiles and other fields. [0003] However, due to the high crystallinity and compact structure of PET, and there is no functional group combined with the dye on the molecular chain, it is difficult for the dye molecule to enter the fiber and dyeing is difficult. Can't satisfy people to bright-coloured beautiful, the fabric demand of unique style. [0004] The reason for the diffic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08G63/183C08G63/78
CPCC08G63/183C08G63/78D01F6/84D06P3/54C08G63/81D01F6/62
Inventor 范红卫刘志立李文刚汤方明王丽丽尹立新
Owner JIANGSU HENGLI CHEM FIBER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap