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Polyester fiber modified with dihydric alcohol with main chain containing silicon and preparation method of polyester fiber

A technology for modifying polyester and diol, which is applied in the field of polyester fiber, can solve problems such as high cost, high energy consumption, and lack of active groups, and achieve the effects of increasing activity, reducing the amount of addition, and improving dyeing performance

Active Publication Date: 2019-06-07
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because polyester is a hydrophobic fiber, its molecules do not contain hydrophilic groups, and its molecular structure lacks active groups that can combine with dyes like cellulose or protein fibers, so the dyeing performance of polyester fibers is not good.
In addition, the finished polyester fiber has a partially crystalline supramolecular structure, and its crystalline molecular chains are parallel to each other, mostly in a trans conformation, while the amorphous region is mostly in a cis conformation, and its molecules are arranged quite closely, which further increases the polyester Fiber Dyeing Difficulty
At present, conventional polyester (PET) fibers are generally dyed with disperse dyes at high temperature (130°C) and high pressure. Only dyeing at high temperature and high pressure can ensure the dyeing rate of the fiber, and high temperature and high pressure have high requirements for equipment and low energy consumption. At the same time, due to the difficulty of dyeing, the time required for dyeing is longer, resulting in higher cost of the process, which limits the application of colorful polyester fibers to a certain extent
Although there are methods such as chemical modification in the prior art, such as by introducing the third or fourth component for copolymerization, or by introducing functional groups with different characteristics, or improving the affinity of polyester macromolecules to dyes The dyeing performance of polyester fiber, but it may have limited improvement on the dyeing performance of the fiber, or the preparation technology is complicated and uncontrollable, or the modification method has a great influence on other properties of the fiber such as mechanical properties
[0004] In addition, at this stage, 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 antimony-based catalyst added in a small amount cannot 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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  • Polyester fiber modified with dihydric alcohol with main chain containing silicon and preparation method of polyester fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of preparation method of main chain silicon-containing glycol modified polyester fiber, the steps are as follows:

[0054] (1) Preparation of doped modified Sb 2 o 3 ;

[0055] (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;

[0056] (1.2) Add dropwise ammonia water with a concentration of 2 mol / L until the pH value of the mixed solution is 9 to obtain a precipitated product, and then wash and dry the precipitated product at a temperature of 105° C. for 2.5 hours;

[0057] (1.3) The dried product was first heated to 400°C and then kept for 2.5h, then heated to 900°C and kept for 1.5h, and finally cooled in air and pulverized to obtain doped modified Sb with an average particle size of 0.4 microns 2 o 3 Powder;

[0058](2) prepare modified polyester;

[0059] (2.1) Esterification r...

Embodiment 2

[0074] A kind of preparation method of main chain silicon-containing glycol modified polyester fiber, the steps are as follows:

[0075] (1) Preparation of doped modified Sb 2 o 3 ;

[0076] (1.1) The concentration of 0.5mol% 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;

[0077] (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;

[0078] (1.3) The dried product was first heated to 400°C and then kept for 2h, then heated to 900°C and kept for 1h, and finally cooled in air and pulverized to obtain doped modified Sb with an average particle size of 0.4 microns 2 o 3 Powder;

[0079] (2) prepare modified polyester;

[008...

Embodiment 3

[0091] A kind of preparation method of main chain silicon-containing glycol modified polyester fiber, the steps are as follows:

[0092] (1) Preparation of doped modified Sb 2 o 3 ;

[0093] (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;

[0094] (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, and then wash and dry the precipitated product at a temperature of 105° C. for 3 hours;

[0095] (1.3) The dried product was first heated to 400°C and 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;

[0096] (2) prepare modified polyester;

[0097] (2.1) Esterification reaction...

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Abstract

The invention relates to a polyester fiber modified with dihydric alcohol with the main chain containing silicon and a preparation method of the polyester fiber. The preparation method comprises the steps that according to the HOY technology, the polyester fiber modified with the dihydric alcohol with the main chain containing the silicon is prepared from modified polyester melt, wherein the preparation method of the modified polyester comprises the steps that phthalic acid, glycol, the dihydric alcohol with the main chain containing the silicon and doping modified Sb2O3 powder are evenly mixed and then sequentially subjected to esterification and polycondensation, the dihydric alcohol with the main chain containing the silicon is dimethylsilanediol or dimethyl diphenyl disiloxanediol or tetramethyldisiloxanediol. The dye-uptake of the polyester fiber modified with the dihydric alcohol with the main chain containing the silicon is 87.5-93.2% at the temperature of 120 DEG C, and the K / Svalue is 22.35-25.43. The method is simple in process, and the finally prepared polyester fiber modified with the dihydric alcohol with the main chain containing the silicon is excellent in dyeing property and high in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a silicon-containing glycol-modified polyester fiber in the main chain 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] However, because polyester is a hydrophobic fiber, its molecules do not contain hydrophilic g...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/10C08G63/695C08G63/86
Inventor 李文刚王丽丽张关健刘灯胜
Owner JIANGSU HENGLI CHEM FIBER
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