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A kind of fluorine-containing dibasic acid modified polyester fdy fiber and preparation method thereof

A technology of modifying polyester and dibasic acid, applied in the direction of fiber chemical characteristics, single-component polyester rayon, rayon manufacturing, etc. Degradation efficiency and other issues

Active Publication Date: 2020-07-07
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, polyester modification methods include physical (blending) modification, chemical (copolymerization) modification, inorganic nano-modification, reactive extrusion, addition and reinforcement modification, filling and composite modification, etc., while physical and chemical Modification is the most commonly used two types of modification methods. However, the common modification methods have not significantly improved the natural degradation efficiency of PET. Therefore, it is an urgent problem to be solved to improve the natural degradation rate of PET fibers and improve its recycling rate.
[0005] In addition, at this stage, the catalysts often used in the polyester synthesis process are antimony-based catalysts, and the common antimony-based catalysts on the market such as Sb 2 o 3 The amount added in the polyester synthesis process is large, and the large amount of antimony-based catalysts has a greater impact on the environment, which is not conducive to the environmental protection production of polyester. At the same time, the antimony-based catalysts will be converted into antimony in the polycondensation reaction. , so that the gray color and brightness of polyester are reduced, the greater the amount of antimony-based catalyst added, the greater the impact on the color and quality of polyester, but the small amount of antimony-based catalyst can not react to all the raw materials involved in polyester synthesis. Catalysis, unable to meet the needs of polyester production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A preparation method of fluorine-containing dibasic acid modified polyester FDY fiber, the specific steps are as follows:

[0073] (1) prepare fluorine-containing dibasic acid modified polyester;

[0074] (1.1) Preparation of doped modified Sb 2 o 3 ;

[0075] (1.1.1) Mg(NO 3 ) 2 aqueous solution with a concentration of 8 mol% Sb 2 o 3 The solution is mixed evenly, Sb 2 o 3 The solvent of the solution is oxalic acid, the Mg in the mixture 2+ with Sb 3+ The molar ratio is 2:100;

[0076] (1.1.2) Add dropwise ammonia water with a concentration of 2 mol / L until the pH of the mixed solution is 9 to obtain a precipitated product, then wash and dry the precipitated product at a temperature of 105°C for 2.5 hours;

[0077] (1.1.3) The dried product is firstly heated to 400°C and then kept for 2.5 hours, then heated to 900°C and kept for 1.5h, and finally cooled in air and pulverized to obtain a doped modified product with an average particle size of 0.4 microns. Sb...

Embodiment 2

[0099] A preparation method of fluorine-containing dibasic acid modified polyester FDY fiber, the specific steps are as follows:

[0100] (1) prepare fluorine-containing dibasic acid modified polyester;

[0101] (1.1) Preparation of doped modified Sb 2 o 3 ;

[0102] (1.1.1) Ca(NO 3 ) 2 Aqueous solution with a concentration of 5 mol% Sb 2 o 3 The solution is mixed evenly, Sb 2 o 3 The solvent of the solution is oxalic acid, the Ca in the mixture 2+ with Sb 3+ The molar ratio is 1:100;

[0103] (1.1.2) Add dropwise ammonia water with a concentration of 2 mol / L until the pH value of the mixed solution is 10 to obtain a precipitated product, and then wash and dry the precipitated product at a temperature of 110° C. for 2 hours;

[0104] (1.1.3) The dried product was first heated to 400°C and then kept for 2 hours, then heated to 900°C and kept for 1 hour, and finally cooled in air and pulverized to obtain doped modified Sb with an average particle size of 0.4 microns ...

Embodiment 3

[0114] A preparation method of fluorine-containing dibasic acid modified polyester FDY fiber, the specific steps are as follows:

[0115] (1) prepare fluorine-containing dibasic acid modified polyester;

[0116] (1.1) Preparation of doped modified Sb 2 o 3 ;

[0117] (1.1.1) Ba(NO 3 ) 2 Aqueous solution with a concentration of 10 mol% Sb 2 o 3 The solution is mixed evenly, Sb 2 o 3 The solvent of the solution is oxalic acid, Ba in the mixture 2+ with Sb 3+ The molar ratio is 3:100;

[0118] (1.1.2) Add dropwise ammonia water with a concentration of 2 mol / L until the pH of the mixed solution is 9.5 to obtain a precipitated product, then wash and dry the precipitated product at a temperature of 105°C for 3 hours;

[0119] (1.1.3) The dried product was first heated to 400°C and then kept for 3 hours, then heated to 900°C and kept for 2 hours, and finally cooled in air and pulverized to obtain doped modified Sb with an average particle size of 0.5 microns 2 o 3 Powder...

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Abstract

The invention relates to fluorine-contained binary acid modified polyester FDY fibers and a preparation method thereof. Fluorine-contained binary acid modified polyester melts are spun to prepare thefluorine-contained binary acid modified polyester FDY fibers; the preparation method of the fluorine-contained binary acid modified polyester FDY fibers includes the steps that terephthalic acid, ethylene glycol, fluorine-containing binary acid, solid heteropolyacid powder which is roasted at high temperature and metallic oxide doped and modified Sb2O3 powder are mixed uniformly and then subjectedto an esterification reaction and a condensation polymerization reaction, wherein solid heteropolyacid is one or more SiO2-TiO2, SiO2-ZrO2, B2O3-Al2O3, TiO2-ZnO and SiO2-CaO, and after the fluorine-contained binary acid modified polyester FDY fibers are put for 60 months under the conditions that the temperature is 25 DEG C, and relative humidity is 65%, the intrinsic viscosity is decreased by 20-26%. The method is simple in technology, and the fluorine-contained binary acid modified polyester FDY fibers are high in natural degrading efficiency and good in quality.

Description

technical field [0001] The invention belongs to the technical field of modified fibers, and relates to a fluorine-containing dibasic acid modified polyester FDY fiber and a preparation method thereof. Background technique [0002] Polyester is the trade name of polyester fiber in my country, and it is an important variety in synthetic fibers. It is a fiber-forming high polymer prepared from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation reactions. Polyethylene terephthalate (PET), a fiber made by spinning and post-processing. Polyester fiber not only has good heat resistance, chemical resistance, mechanical properties and electrical properties, but also has the advantages of good transparency, good insulation, low production cost and high cost performance. [0003] A large amount of polyester fibers will become waste after use. Although polyester (PET) will not dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/10C08G63/682C08G63/86
Inventor 孙晓华尹立新王丽丽
Owner JIANGSU HENGLI CHEM FIBER
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