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A method for reducing oligomer content in polyester fiber

A polyester fiber and oligomer technology, which is applied in the field of reducing the content of oligomers in polyester fibers, can solve the problems of high and low fiber quality, and achieve the effects of reducing the amount of production, increasing the cross-sectional area, and reducing the degree of coking

Active Publication Date: 2020-02-21
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the oligomer content in the polyester fiber is relatively high and lower the fiber quality in the prior art, and to provide a method that can significantly reduce the content of the oligomer in the polyester fiber and will not affect the polyester itself. How Performance Impacts

Method used

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  • A method for reducing oligomer content in polyester fiber
  • A method for reducing oligomer content in polyester fiber
  • A method for reducing oligomer content in polyester fiber

Examples

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Effect test

Embodiment 1

[0056] A method for reducing the content of oligomers in polyester fibers, first introducing branched diol segments into the molecular chain of polyester to obtain modified polyester, and then preparing polyester by spinning modified polyester In the cooling process of the fibers, the longitudinal height remains unchanged, and the cross-sectional area of ​​the slow cooling chamber is increased, while the slow cooling chamber adopts heat preservation to maintain the surface temperature of the spinneret.

[0057] Wherein modified polyester preparation method is as follows:

[0058] (a) Esterification reaction: terephthalic acid, ethylene glycol and 2-ethyl-2-methyl-1,3-propanediol in a molar ratio of 1:1.2:0.03 are made into a slurry, and antimony trioxide is added , titanium dioxide and triphenyl phosphate are mixed evenly, and the esterification reaction is carried out under pressure in a nitrogen atmosphere. The pressurized pressure is normal pressure, and the temperature of ...

Embodiment 2

[0064] A method for reducing the content of oligomers in polyester fibers, first introducing branched diol segments into the molecular chain of polyester to obtain modified polyester, and then preparing polyester by spinning modified polyester In the cooling process of the fibers, the longitudinal height remains unchanged, and the cross-sectional area of ​​the slow cooling chamber is increased, while the slow cooling chamber adopts heat preservation to maintain the surface temperature of the spinneret.

[0065] Wherein modified polyester preparation method is as follows:

[0066] (a) Esterification reaction; prepare terephthalic acid, ethylene glycol and 2,2-diethyl-1,3-propanediol in a molar ratio of 1:1.3:0.04 into a slurry, add ethylene glycol antimony, titanium dioxide After mixing evenly with trimethyl phosphate, carry out the esterification reaction under pressure in a nitrogen atmosphere. The pressurized pressure is normal pressure, and the temperature of the esterifica...

Embodiment 3

[0072] A method for reducing the content of oligomers in polyester fibers, first introducing branched diol segments into the molecular chain of polyester to obtain modified polyester, and then preparing polyester by spinning modified polyester In the cooling process of the fibers, the longitudinal height remains unchanged, and the cross-sectional area of ​​the slow cooling chamber is increased, while the slow cooling chamber adopts heat preservation to maintain the surface temperature of the spinneret.

[0073] Wherein modified polyester preparation method is as follows:

[0074] (a) Esterification reaction: terephthalic acid, ethylene glycol, and 2-butyl-2-ethyl-1,3-propanediol in a molar ratio of 1:1.4:0.05 are made into a slurry, and antimony acetate and titanium dioxide are added After mixing evenly with trimethyl phosphite, carry out esterification reaction under pressure in a nitrogen atmosphere. 92% is the end point of the esterification reaction, wherein the addition ...

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Abstract

The invention relates to a method for reducing the content of oligomers in polyester fibers. Firstly, a diol chain segment with a branched chain is introduced into a molecular chain of polyester to obtain modified polyester, then in a cooling step of spinning preparation of the polyester fibers by the modified polyester, the vertical height is kept unchanged and the cross section area of a slow cooling chamber is increased; at the same time, the slow cooling chamber maintains the plate surface temperature of a spinneret plate by the way of heat preservation; diol with the branched chain has the following structural formula defined in the specification, wherein R1 and R2 are independently selected from straight-chain alkylene with the carbon atom number of 1-3 , R3 is selected from alkyl with the carbon atom number of 1-5, and R4 is selected from alkyl with the carbon atom number of 2-5. The method is simple, the content of cyclic oligomers in the polyester fibers is less than or equalto 0.6 wt%, and the content of linear oligomers is less than or equal to 0.3 wt%; the polyester fibers has highly promising application prospect.

Description

technical field [0001] The invention belongs to the field of fiber preparation and relates to a method for reducing the content of oligomers in polyester fibers. Background technique [0002] Polyethylene terephthalate (PET) is a polymer with excellent properties. PET is widely used in fibers, bottles because of its advantages such as high modulus, high strength, good shape retention and good barrier properties. In the fields of packaging, film and sheet materials, the output is increasing year by year, and the industry status has been significantly improved. [0003] However, during the polycondensation reaction of synthesizing ethylene terephthalate, especially when producing linear high polymers, linear and cyclic oligomers are also accompanied by high-temperature oxidative degradation, and cyclic oligomers are polycondensed The stage is formed due to the back-biting and cyclization of the macromolecular chain ends. More than 70% of the cyclic oligomers are cyclic trimer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92C08G63/183C08G63/16D01D13/02
CPCC08G63/16C08G63/183D01D13/02D01F6/92
Inventor 汤方明代居宴陈瑞王小雨
Owner JIANGSU HENGLI CHEM FIBER
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