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Preparation method of nylon-6-based polyesteramide fiber

A technology based on polyesteramide and nylon, which is applied in the field of polymer fiber preparation, can solve problems such as molecular weight reduction, additive removal, and inability to form fibers, and achieve high polymerization completion, increased crystallinity, and superimposed effects of excellent properties

Active Publication Date: 2019-05-03
JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, nylon 6-based polyamide ester exists in the reaction thermodynamic equilibrium system, caprolactam monomer and cyclic oligomer cannot be completely reacted, and cannot be removed by adding additives, and there will be 6-10% unreacted in the equilibrium product Monomers and Cyclic Oligomers
The spinning process has high requirements for nylon 6-based chips. If the copolymer contains a large amount of oligomers, the oligomers will nucleate in different phases in the system, and the crystal nuclei will continue to grow during the winding and drawing process. When the grain size exceeds the fiber diameter, stress concentration will occur and fracture will occur. At the same time, if the slice is subjected to hydrothermal extraction according to the traditional nylon 6 slice method, the ester bond in the nylon 6-based polyamide ester will be hydrothermally degraded, and the molecular weight will be greatly reduced. , even down to a level where fiber formation is impossible

Method used

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  • Preparation method of nylon-6-based polyesteramide fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A kind of preparation method of nylon 6 base polyamide ester fiber, the steps are as follows:

[0059] (1) prepare nylon 6 base polyamide ester polymer;

[0060] (1.1) At a temperature of 60°C, nylon 66 salt and NH 2 (CH 2 ) 4 A mixture of COOH (mass ratio 1:1), caprolactam, HOOC (CH 2 ) 2 COOH and deionized water were mixed with mechanical stirring to obtain a mixture, HOOC(CH 2 ) 2 The amount of COOH added is 11wt% of the amount of caprolactam added, the amount of deionized water added is 2wt% of the amount of caprolactam added, nylon 66 salt and NH 2 (CH 2 ) 4 The addition amount of the mixture of COOH is 0.2wt% of the addition amount of caprolactam, the rotating speed of mechanical stirring is 80r / min, and the time is 10min;

[0061] (1.2) The mixture is subjected to prepolymerization to obtain a dibasic acid-terminated nylon 6 prepolymer. The temperature of the prepolymerization is 220° C., the pressure is 0.5 MPa, the atmosphere is nitrogen, and the termi...

Embodiment 2

[0069] A kind of preparation method of nylon 6 base polyamide ester fiber, the steps are as follows:

[0070] (1) prepare nylon 6 base polyamide ester polymer;

[0071] (1.1) At a temperature of 100°C, mix nylon 66 salt with NH 2 (CH 2 ) 6 A mixture of COOH (mass ratio 1:1), caprolactam, HOOC (CH 2 ) 3 COOH and deionized water were mixed with mechanical stirring to obtain a mixture, HOOC(CH 2 ) 3 The amount of COOH added is 17wt% of the added amount of caprolactam, the amount of deionized water added is 2.5wt% of the added amount of caprolactam, nylon 66 salt and NH 2 (CH 2 ) 6 The addition amount of the mixture of COOH is 0.8wt% of the addition amount of caprolactam, the rotating speed of mechanical stirring is 150r / min, and the time is 30min;

[0072] (1.2) The mixture is subjected to a prepolymerization reaction to obtain a dibasic acid-terminated nylon 6 prepolymer. The temperature of the prepolymerization reaction is 280° C., the pressure is 1.3 MPa, the atmosphe...

Embodiment 3

[0080] A kind of preparation method of nylon 6 base polyamide ester fiber, the steps are as follows:

[0081] (1) prepare nylon 6 base polyamide ester polymer, concrete preparation steps are with embodiment 1;

[0082] (2) Nylon 6-based polyamide ester polymer is melt-spun to obtain nylon 6-based polyamide ester fiber. The melt-spinning process is FDY process, and the parameters are: spinning temperature 265°C, first godet speed 4000m / min, the speed of the second godet is 5000m / min, the draw ratio is 1.1 times, the cooling air temperature is 15°C, the cooling air speed is 0.8m / s, and the relative humidity of the cooling air is 60%.

[0083] The monofilament fineness of the finally prepared nylon 6-based polyamide fiber is 3 dtex, the breaking strength is 2.5 cN / dtex, and the stiffness of the fabric made from the nylon 6-based polyamide fiber is 4.5 mN*cm.

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Abstract

The invention relates to a preparation method of a nylon-6-based polyesteramide fiber. The method comprises the steps of carrying out melt spinning on a nylon-6-based polyesteramide polymer to obtainthe nylon-6-based polyesteramide fiber. A preparation method of the nylon-6-based polyesteramide polymer comprises the steps of mixing nylon-6 prepolymer ester with a polyester prepolymer and then carrying out an ester exchange reaction to obtain the nylon-6-based polyesteramide polymer. The nylon-6 prepolymer ester is prepared by firstly synthesizing a dibasic-acid-terminated nylon-6 prepolymer and then adding dihydric alcohol to enable dihydric alcohol to react with carboxyl of terminal groups. According to the preparation method of the nylon-6-based polyesteramide fiber, the nylon-6-based polyesteramide polymer is obtained through a copolymerization approach, so that the uniformity of nylon-6 and polyester blocks is improved, and the phase domain is controllable; polyesteramide slices containing polyester chain segments at different ratios can be obtained by changing the addition quantity of the polyester prepolymer, so that the sequence structure is controllable, and the polymerization process is flexible. The prepared fiber has high spinnability and stiffness and can be applied to the fields of clothing, home textiles, automobile interior decoration and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer fiber preparation and relates to a preparation method of nylon 6-based polyamide ester fiber. Background technique [0002] Nylon fiber has excellent physical properties unmatched by polyester fiber. For example, nylon fiber has higher breaking strength, wear resistance ranks first among general textile fibers, good hygroscopicity, excellent elastic recovery rate and fatigue resistance, and excellent dyeing performance. In addition to the use of clothing and decoration, nylon fibers are also widely used in other industries. For example, new products have been developed in tire cord fabrics, automotive textiles, filter materials, and BCF carpet bulky yarns. There are many varieties of nylon fibers, the main varieties are nylon 6 and nylon 66 fibers, and our country mainly produces nylon 6 fibers. [0003] With the continuous improvement of people's living standards, the requirements for textiles a...

Claims

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Application Information

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IPC IPC(8): D01F6/80C08G69/44
Inventor 张圣明王朝生王华平吉鹏方运华黄家鹏张景春
Owner JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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