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Polyester DTY fiber and preparation method thereof

A technology of polyester and fiber, which is applied in the field of polyester POY fiber and its preparation, can solve the problems of the adverse effect of polyester performance and the inability to significantly reduce the cyclic oligomers in polyester, and achieve the effect of excellent performance

Active Publication Date: 2018-08-10
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the above-mentioned prior art cannot significantly reduce the content of cyclic oligomers in polyester and will adversely affect the performance of polyester itself, and provide a method that can significantly reduce the content of cyclic oligomers in polyester. The content of polymer can effectively improve the preparation method of polyester fiber, mainly by adding a branched diol with a specific structure to the polyester raw material.

Method used

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  • Polyester DTY fiber and preparation method thereof
  • Polyester DTY fiber and preparation method thereof
  • Polyester DTY fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A kind of preparation method of polyester POY fiber, concrete steps are as follows:

[0069] (1) Preparation of modified polyester:

[0070] (a) Esterification reaction; make a slurry of terephthalic acid, ethylene glycol and 2-ethyl-2-methyl-1,3-propanediol with a molar ratio of 1:1.2:0.03, and add antimony trioxide , 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 the esterification reaction is 250°C. 90% of the value is the end point of the esterification reaction, wherein the addition of antimony trioxide is 0.01% of the weight of terephthalic acid, the addition of titanium dioxide is 0.20% of the weight of terephthalic acid, and the addition of triphenyl phosphate 0.05% of the weight of terephthalic acid, wherein the structural formula of 2-ethyl-2-methyl-1,3-propanediol is as follows:

[0071]

...

Embodiment 2

[0077] A kind of preparation method of polyester POY fiber, concrete steps are as follows:

[0078] (1) Preparation of modified polyester:

[0079] (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 antimony ethylene glycol and 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 esterification reaction is 260°C. 91% is the end point of the esterification reaction, wherein the addition of ethylene glycol antimony is 0.02% of the weight of terephthalic acid, the addition of titanium dioxide is 0.21% of the weight of terephthalic acid, and the addition of trimethyl phosphate is 0.02% of the weight of terephthalic acid. 0.03% by weight of phthalic acid, wherein the structural formula of 2,2-diethyl-1,3-propanediol is as...

Embodiment 3

[0085] A kind of preparation method of polyester POY fiber, concrete steps are as follows:

[0086] (1) Preparation of modified polyester:

[0087] (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 of antimony acetate is 0.03% of the weight of terephthalic acid, the addition of titanium dioxide is 0.23% of the weight of terephthalic acid, and the addition of trimethyl phosphite is 0.03% of the weight of terephthalic acid. 0.01% by weight of phthalic acid, wherein the structural formula of 2-butyl-2-ethyl-1,3-propanediol is as follows:

[0088]

[0089] (b) polycondensation reaction; after the esterification reaction ends, sta...

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Abstract

The invention relates to polyester DTY fiber and a preparation method thereof. The preparation method comprises: metering a modified polyester melt, extruding, cooling, oiling, and winding to preparethe polyester POY fiber. According to the present invention, during the cooling, the longitudinal height is maintained, and the cross section area of the slow cooling chamber is increased while the plate surface temperature of the spinning plate is maintained by using the thermal insulation method; the material of the fiber is the modified polyester, the molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment having the branched chain, the structure formula of the diol chain segment having the branched chain is defined in the specification, R1 and R2 are respectively and independently selected from straight chain alkylidene with a carbon atom number of 1-3, R3 is selected from alkyl with a carbon atomnumber of 1-5, and R4 is selected from alkyl with a carbon atom number of 2-5; the chromatic aberration [delta]E of the prepared fiber is less than 0.200; and the preparation process is simple and reasonable, and the obtained fiber has excellent performance.

Description

technical field [0001] The invention belongs to the field of fiber preparation, and relates to a polyester POY fiber and a preparation method thereof. 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 trimers. The cycl...

Claims

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Application Information

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IPC IPC(8): D01F6/84D01F11/08C08G63/183C08G63/78D01D1/09D01D5/088
CPCC08G63/183C08G63/78D01D1/09D01D5/088D01F6/84D01F11/08
Inventor 李文刚熊克刘灯胜张元华
Owner JIANGSU HENGLI CHEM FIBER
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