Preparation method of high-strength regenerated polyamide 66 fibers

A high-strength, nylon technology, used in fiber processing, melt spinning, stretch spinning, etc., can solve the problems of mixed recycling, uneven mixing, and insufficient filtration.

Pending Publication Date: 2021-06-04
PINGDINGSHAN SHENMA TIRE CORD FABRIC DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Utilizing the technical solution of the present invention to prepare regenerated nylon 66 can effectively improve the strength of t

Method used

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  • Preparation method of high-strength regenerated polyamide 66 fibers

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Effect test

Embodiment 1

[0036] The preparation method of high-strength regenerated nylon 66 fiber of the present invention, the detailed steps of this preparation method are as follows:

[0037] a. Recycle clean nylon 66 waste silk with a viscosity of 3.2-3.4 in the nylon 66 fiber production line as raw material, use a screw extruder to melt the obtained nylon 66 waste silk through a screw extruder at a temperature of 285-295 ° C in multiple stages, and then pass through a secondary screw Melt at 278-285°C, and obtain a polymer mixture with a viscosity of 3.2-3.4 after two-stage melting;

[0038] b. The polymer mixture obtained in step a is filtered with a 500-mesh filter screen, and then extruded through the casting head after filtering, and the obtained casting belt is cooled and solidified into a strip polymer through a water tank, and the solidified strip polymer is solidified by a pelletizer. Cut to obtain regenerated nylon 66 slices with a viscosity of 2.8 and a specification of 2.5mm*3.2mm;

...

Embodiment 2

[0049] The preparation method of high-strength regenerated nylon 66 fiber of the present invention, the detailed steps of this preparation method are as follows:

[0050] a. Recycling clean nylon 66 waste silk with a viscosity of 3.3-3.5 as raw material in the nylon 66 fiber production line, using a screw extruder to melt the obtained nylon 66 waste silk through a first-stage screw at 285-295°C in multiple stages, and then through a second-stage screw Melt at 278-285°C, and obtain a polymer mixture with a viscosity of 3.3-3.5 after two-stage melting;

[0051] b. The polymer mixture obtained in step a is filtered with a 500-mesh filter screen, and then extruded through the casting head after filtering, and the obtained casting belt is cooled and solidified into a strip polymer through a water tank, and the solidified strip polymer is solidified by a pelletizer. Cut to obtain regenerated nylon 66 slices with a viscosity of 2.9 and a specification of 2.5mm*3.2mm;

[0052] c. Use...

Embodiment 3

[0062] The preparation method of high-strength regenerated nylon 66 fiber of the present invention, the detailed steps of this preparation method are as follows:

[0063] a. Recycling clean nylon 66 waste silk with a viscosity of 3.3-3.5 as raw material in the nylon 66 fiber production line, using a screw extruder to melt the obtained nylon 66 waste silk through a first-stage screw at 285-295°C in multiple stages, and then through a second-stage screw Melt at 278-285°C, and obtain a polymer mixture with a viscosity of 3.3-3.5 after two-stage melting;

[0064] b. The polymer mixture obtained in step a is filtered with a 500-mesh filter screen, and then extruded through the casting head after filtering, and the obtained casting belt is cooled and solidified into a strip polymer through a water tank, and the solidified strip polymer is solidified by a pelletizer. Cut to obtain regenerated nylon 66 slices with a viscosity of 3.0 and a specification of 2.5mm*3.2mm;

[0065] c. Use...

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Abstract

The invention discloses a preparation method of high-strength regenerated polyamide 66 fibers. The method comprises the following steps of by taking polyamide 66 waste silk as a raw material, performing two-stage melting to obtain a polymer mixture; then performing filtering through a filter screen, extruding, cooling, curing and cutting to obtain regenerated polyamide 66 slices; sequentially performing drying, humidifying-tackifying, vibration screening and re-heating melting on the obtained slices to obtain a molten regenerated polyamide 66 polymer; and then performing mixing, filtering by a spinning assembly, spinning by a spinneret plate and cooling, oiling cooled tows, homogenizing tow oil films, performing drafting and setting, and finally performing winding and forming to obtain the high-strength regenerated polyamide 66 fibers. Through the improvement of multiple technical characteristics, the strength of the prepared regenerated polyamide 66 fibers reaches 7.5-9.5 g/d. According to the invention, the batch continuous production of the high-strength regenerated polyamide 66 fibers is realized, the batch performance of the fibers is uniform and stable, and the blank of a production technology of the high-strength regenerated polyamide 66 fibers in China is filled.

Description

[0001] 1. Technical field: [0002] The invention belongs to the technical field of nylon 66 fiber production, and in particular relates to a preparation method of high-strength regenerated nylon 66 fiber. [0003] 2. Background technology: [0004] The scientific name of nylon is polyamide fiber, which is the general name of polyamide fibers produced in China. It is called nylon internationally. It has the characteristics of high strength, wear resistance and good resilience. The wear resistance is 10 times that of cotton fiber. 10 times that of dry viscose fiber and 140 times that of wet fiber. The main varieties of nylon are nylon 6 and nylon 66. Their physical properties are similar, and they have good moth resistance and corrosion resistance. They can be purely spun or blended for various clothing and knitwear. A better variety, clothing made of nylon is more comfortable to wear than polyester clothing. Nylon 66 medium and low denier industrial yarn has the advantages of...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01F6/60D01D1/10D01D5/096D01D5/16D01D10/02D01D7/00
CPCD01D1/106D01D5/08D01D5/096D01D5/16D01D7/00D01D10/02D01F6/60
Inventor 仵晓李新吕文娟路晓冬李伟杨朝勇吕忠信陈正福王锦涛陈晓许谢巧丽孟为库高晓兵魏红霞石华孙志军
Owner PINGDINGSHAN SHENMA TIRE CORD FABRIC DEV CO LTD
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