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One-step spun elastic composite yarn and preparation method thereof

A composite yarn and elastic technology, applied in the field of polyester fibers, can solve the problems of poor dyeing performance, high equipment requirements, and high dyeing cost of spinning elastic composite yarns, and can shorten the dyeing time, reduce the dyeing temperature, and increase the oxygen adsorption capacity. Effect

Active Publication Date: 2019-04-12
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of poor dyeing performance, high requirements on equipment, high dyeing cost and slow degradation rate of the existing one-step spinning elastic composite yarn, and provide a kind of dyeing performance that is excellent, low in requirements on dyeing equipment, and low in dyeing cost. One-step spinning elastic composite yarn capable of high-efficiency degradation and recycling treatment and preparation method thereof

Method used

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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  • One-step spun elastic composite yarn and preparation method thereof
  • One-step spun elastic composite yarn and preparation method thereof
  • One-step spun elastic composite yarn and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A kind of preparation method of one-step spinning elastic composite yarn, and its concrete steps are as follows:

[0066] (1) Preparation of modified polyester;

[0067] (1.1) Preparation of doping-modified Bi 2 O 3 ;

[0068] (1.1.1) Ca(NO) with a concentration of 2.5 wt% 3 ) 2 Aqueous solution with 22wt% Bi 2 O 3 The solution is mixed evenly, Bi 2 O 3 The solvent of the solution is nitric acid, and Ca in the mixture 2+ with Bi 3+ The molar ratio is 7:100;

[0069] (1.1.2) Ammonia with a concentration of 2 mol / L was added dropwise to a pH of 10 to obtain a precipitated product, and the precipitated product was washed and dried at a temperature of 105°C and a drying time of 2.5h;

[0070] (1.1.3) The dried product was heated to 400°C and kept for 2.5h, then heated to 700°C and kept for 1.5h, and finally cooled in air and pulverized to obtain doped and modified Bi with an average particle size of 0.45 μm 2 O 3 powder;

[0071] (1.2) esterification reaction;...

Embodiment 2

[0087] A kind of preparation method of one-step spinning elastic composite yarn, and its concrete steps are as follows:

[0088] (1) Preparation of modified polyester;

[0089] (1.1) Preparation of doping-modified Bi 2 O 3 ;

[0090] (1.1.1) Ca(NO) with a concentration of 2 wt% 3 ) 2 Aqueous solution with a concentration of 20wt% Bi 2 O 3 The solution is mixed evenly, Bi 2 O 3 The solvent of the solution is nitric acid, and Ca in the mixture 2+ with Bi 3+ The molar ratio is 5:100;

[0091] (1.1.2) Add dropwise ammonia water with a concentration of 2 mol / L until the pH value of the mixture is 9 to obtain a precipitated product, wash and dry the precipitated product, and the drying temperature is 105°C and the drying time is 2h;

[0092] (1.1.3) The dried product was heated to 400°C and then kept for 2h, then heated to 700°C and then kept for 1h, and finally cooled in air and pulverized to obtain doped-modified Bi with an average particle size of 0.4 μm 2 O 3 powder...

Embodiment 3

[0100] A kind of preparation method of one-step spinning elastic composite yarn, and its concrete steps are as follows:

[0101] (1) Preparation of modified polyester;

[0102] (1.1) Preparation of 3-trimethylsilyl-3-methyl-1,2-propanediol;

[0103] (1.1.1) Mix 3-trimethylsilyl-3-methylpropene, peracetic acid and dichloromethane in a molar ratio of 1:5:10, and react at a temperature of 35°C for 5 hours, accompanied by stirring during the reaction , the solvent is removed after the reaction, and trimethylsilyl propylene epoxide is obtained through purification and refining;

[0104] (1.1.2) Mix water, concentrated sulfuric acid and trimethylsilyl propylene epoxide, heat to 80°C in a water bath under stirring conditions, keep the reaction for 10min, cool to room temperature after the reaction, neutralize, distill, separate and purify 3-trimethylsilyl-3-methyl-1,2-propanediol shown in formula (I) is obtained, where R in formula (I) is -CH(CH 3 )-, the vitriol oil is the sulfur...

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Abstract

The invention relates to a one-step spun elastic composite yarn and a preparation method thereof. The preparation method comprises the following steps: firstly uniformly mixing terephthalic acid, 1,4-butanediol, dihydric alcohol with a trimethylsilyl side group and doped and modified Bi2O3 powder, then successively performing an esterification reaction and a polycondensation reaction to obtain a polyester with relatively low viscosity, performing solid-phase adhesion-promotion on the modified polyester with the relatively low viscosity to obtain a modified polyester with relatively high viscosity, and performing metering, extruding from a same spinneret hole, cooling, oil applying, drawing, heat setting and winding on two modified polyesters with different viscosity by adopting a parallelcomposite spinning method to obtain the one-step spun elastic composite yarn. The finally prepared product has a dye-uptake rate of 87.3-92.2% at a temperature of 100 DEG C, and the intrinsic viscosity of the product decreases by 15-22% after the product is left for 60 months at a temperature of 25 DEG C and a relative humidity of 65%. The preparation method provided by the invention has the advantages of simple process and low cost; and the obtained product has excellent dyeing performance, high natural degradation rate and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a one-step spinning elastic composite yarn and a preparation method thereof. Background technique [0002] With the continuous improvement of consumption level, people have higher and higher requirements for wearing comfort, and comfort has become the mainstream direction of textile processing today. Elasticity is an important indicator in evaluating the comfort of clothing, which requires the clothing to be able to expand and contract freely with the movement of the human body to adapt to the extensibility of the skin. At present, whether it is fashion processing, or sportswear, casual wear processing, elastic fiber has become one of the indispensable processing raw materials. [0003] PBT fiber not only has the common shape of polyester fiber, but also has lower crystallinity, melting point and glass transition temperature than PET fiber due to the longer flexible part ...

Claims

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Application Information

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IPC IPC(8): D01F6/92C08G63/695C08G63/85D01D5/32D01F1/10
CPCC08G63/6956C08G63/85D01D5/32D01F1/10D01F6/92
Inventor 王山水汤方明王永锋
Owner JIANGSU HENGLI CHEM FIBER
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