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Modified polyester and preparing method thereof

A technology for modifying polyester and polybasic acid, applied in the field of polyester preparation, can solve the problems of poor polyester product performance, reduced polyester thermal stability, and gray polyester color, etc., and achieves high dye uptake, reduced dosage, bright color effect

Active Publication Date: 2016-10-19
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the sake of environmental protection, the trend of the world requires reducing the amount of heavy metals. On the other hand, the addition of too much cobalt compound will not only reduce the thermal stability of polyester, but also make the color of polyester darker, resulting in poor performance of polyester products. poor

Method used

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  • Modified polyester and preparing method thereof
  • Modified polyester and preparing method thereof

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Experimental program
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Effect test

preparation example Construction

[0026] Preparation of Control 1:

[0027] Add 500g PTA, 280g EG (the molar ratio of PTA and EG is 1:1.5), 150ug / g ethylene glycol antimony in turn in the PU2.5 reaction polymerization kettle, and carry out the esterification reaction at 240°C, 0.2-0.3MPa, and 40rpm rotating speed. , when the esterification rate reaches more than 95%, vent to normal pressure, end the esterification, put in 300ug / g triphenyl phosphite, raise the temperature to 280°C, drop the absolute pressure below 100pa, react for 2 hours, and use Nitrogen to eliminate vacuum, discharge, cut into pellets, and dry to obtain polyester chips.

[0028] Preparation of Control 2:

[0029] 500g PTA, 280g EG, 150ug / g ethylene glycol antimony, 3ug / g cobalt phosphate were sequentially added to the PU2.5 reaction polymerization kettle, and the esterification reaction was carried out at 240°C, 0.2-0.3MPa, and 40rpm. More than 95%, vent to normal pressure, end esterification, put in 300ug / g triphenyl phosphite, raise the...

Embodiment 1

[0035] Add 500g PTA, 280gEG, 150ug / g ethylene glycol antimony, 14ug / g cobalt phosphate, 20ug / g calcium carbonate in sequence to the PU2.5 reaction polymerization kettle, and carry out the esterification reaction at 240°C, 0.2-0.3MPa, and 40rpm. , when the esterification rate reaches more than 95%, vent to normal pressure, end the esterification, put in 300ug / g triphenyl phosphite, raise the temperature to 280°C, drop the absolute pressure below 100pa, react for 2 hours, and use Nitrogen to eliminate vacuum, discharge, cut into pellets, and dry to obtain polyester chips.

Embodiment 2

[0037] 500g PTA, 280g EG, 150ug / g ethylene glycol antimony, 10ug / g cobalt phosphate, 10ug / g barium sulfate were added in sequence to the PU2.5 reaction polymerization kettle, and the esterification reaction was carried out at 240°C, 0.2-0.3MPa, and 40rpm. , when the esterification rate reaches more than 95%, vent to normal pressure, end the esterification, add 300ug / g triphenyl phosphite, raise the temperature to 280°C, drop the absolute pressure below 100pa, react for 2 hours, and use Nitrogen to eliminate vacuum, discharge, cut into pellets, and dry to obtain polyester chips.

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Abstract

Modified polyester is disclosed. The modified polyester is prepared mainly from polybasic acid, polyol, a catalyst, a stabilizer and an additive improving polyester yellowing. A preparing process of the polyester is also provided. Compared with the prior art, the modified polyester prepared by the process can obviously improve yellowing of polyester, a cobalt salt adding amount is greatly reduced, and properties in each aspect are excellent.

Description

technical field [0001] The invention relates to a modified polyester and a preparation method thereof, belonging to the technical field of polyester preparation. Background technique [0002] Polyester, especially polyethylene terephthalate (PET), has good physical and mechanical properties, good creep resistance, fatigue resistance, friction resistance and dimensional stability, and is widely used in fibers, bottle flakes, films Sheets, plates, etc. PET is prepared by direct esterification of terephthalic acid (PTA) with ethylene glycol (EG) or transesterification of dimethyl terephthalate (DMT) with ethylene glycol, followed by high temperature and high vacuum. polycondensation. Due to the high temperature and long-term reaction, the polymer will break down the molecular chain due to cracking, which will lead to the formation of vinyl and the increase of carboxyl groups, and the polymer will turn yellow due to the formation of vinyl. [0003] Toners are often used to im...

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
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/181C08G63/16C08G63/86C08G63/85C08K13/02C08K3/32C08K3/26C08K5/526C08K3/30C08K5/098
Inventor 庞道双李乃祥潘小虎钱明球
Owner SINOPEC YIZHENG CHEM FIBER
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