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Preparation method and application of electrospun polyacrylonitrile nanofiber continuous long yarn

A polyacrylonitrile and nanofiber technology, applied in the direction of electrospinning, fiber treatment, fiber chemical characteristics, etc., can solve the problems of discontinuous manufacturing, high linear density, etc., and achieve the effect of enhancing mechanical properties

Pending Publication Date: 2019-08-16
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, electrospinning technology is only used to manufacture non-woven fabrics or to spray a thin layer of nano-spider web on industrial non-woven fabrics (generally, the surface density is 1g / m 2 left and right), and can also produce discontinuous, high-density roving yarns. There is no technology in the world that can continuously produce electrospun nanofiber yarns with ultra-small linear densities or ultra-high counts

Method used

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preparation example Construction

[0022] In order to solve the above-mentioned technical problems, the invention provides a kind of preparation method of electrospun polyacrylonitrile nanofiber continuous long yarn, comprising the following steps:

[0023] a. The polyacrylonitrile raw material is dissolved in a polar solvent under mechanical stirring to obtain a uniform spinning solution;

[0024] b. the polyacrylonitrile solution in the step a is made into a polyacrylonitrile nonwoven fabric in an electrospinning machine;

[0025] c. cutting the non-woven fabric in step b into slender strips with a width of 0.5 to 6 cm;

[0026] d. Stretch the slender strips in step c in a water bath at 80-95°C with a draw ratio of 2-5 times, and then draw them in air at 110-150°C with a draw ratio of 3-10 times , to obtain fiber bundles with highly oriented internal fibers;

[0027] e. Twisting the fiber bundle in step d to obtain a continuous long yarn of electrospun polyacrylonitrile nanofibers with a length not less tha...

Embodiment 1

[0067] Embodiment 1 provides a kind of preparation method of electrospun polyacrylonitrile nanofiber continuous long yarn, comprising the following steps:

[0068] a. Add the polyacrylonitrile raw material and the mixed solvent composed of N,N-dimethylformamide and N,N-dimethylacetamide into the stainless steel reactor and mechanically stir to dissolve, the N,N-dimethylformamide The mass ratio of formamide to N,N-dimethylacetamide is 4:1, the dissolution temperature is 43°C, the stirring time is 8 hours, and the mass concentration of the obtained polyacrylonitrile solution for spinning is 15%;

[0069] b. inject the solution obtained in step a into the spinning device of the electrospinning machine, spray spinning in a high-voltage electric field with a DC voltage of 42kV, and collect it with a stainless steel mesh belt to obtain an electrospun polyacrylonitrile nonwoven fabric. The distance between the stainless steel mesh belt collectors is 33 cm, the running speed of the st...

Embodiment 2

[0074] Embodiment 2 provides a kind of preparation method of electrospun polyacrylonitrile nanofiber continuous long yarn, comprising the following steps:

[0075] a. Add polyacrylonitrile raw material and N,N-dimethylformamide into a stainless steel reactor and mechanically stir to dissolve. The dissolution temperature is 43°C and the stirring time is 8 hours. The quality of the obtained polyacrylonitrile solution for spinning The concentration is 15%;

[0076] b. inject the solution obtained in step a into the spinning device of the electrospinning machine, spray spinning in a high-voltage electric field with a DC voltage of 42kV, and collect it with a stainless steel mesh belt to obtain an electrospun polyacrylonitrile nonwoven fabric. The distance between the stainless steel mesh belt collectors is 33 cm, the running speed of the stainless steel mesh belt is 3 m / min, and the diameter of spinning is 150 nanometers;

[0077] c. cutting the nonwoven fabric obtained in step b...

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Abstract

The invention discloses a preparation method of electrospun polyacrylonitrile nanofiber continuous long yarn. The method comprises following steps: a, a polyacrylonitrile raw material is dissolved ina polar solvent under mechanical stirring, and a homogeneous spinning solution is obtained; b, polyacrylonitrile non-woven fabric is prepared from the polyacrylonitrile solution obtained in step a inan electrostatic spinning machine; c, the non-woven fabric obtained in step b is slit into thin long strips which are 0.5-6 cm long; d, the thin long strips obtained in step c are drafted in water bath at 80-95 DEG C at the draft ratio being 2-5 times and then are drafted in air at 110-150 DEG C at the draft ratio being 3-10 times, and fiber bundles with highly oriented internal fibers are obtained; e, the fiber bundles in step d are twisted, and the electrospun polyacrylonitrile nanofiber continuous long yarn with length not smaller than 2,000 m is obtained.

Description

technical field [0001] The invention relates to the field of polymer fiber continuous long yarn, in particular to a preparation method and application of electrospun polyacrylonitrile nanofiber continuous long yarn. Background technique [0002] Polyacrylonitrile fiber, commonly known as acrylic fiber or artificial wool, is a commonly used man-made fiber. It can replace wool or blend with wool to make wool fabric. It has a good thermal insulation effect, and it also has excellent weather resistance and light resistance. After one year, the strength only drops by 20%, so it is often used to make curtains, tarpaulins, etc. [0003] Electrospinning is a special fiber manufacturing process, which has been increasingly used to prepare nanofiber materials in the past ten years. It is solidified in a running distance, and finally the spinning is received by the receiving device. Because the electrospinning process is simple, various forms of fibers can be produced according to th...

Claims

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Application Information

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IPC IPC(8): D02G3/02D02G3/26D04H3/033D04H3/007D02J1/22
CPCD02G3/02D02G3/26D02J1/223D02J1/228D04H3/007D04H3/033D10B2321/10D01D5/003D01D5/426D01F6/18D02G3/06
Inventor 侯豪情欧阳文王煜明程楚云王琦吕晓义
Owner JIANGXI XIAN CAI NANOFIBERS TECH