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Method for melt spinning of polyacrylonitrile PAN by taking imidazole ionic fluid as plasticizing agent

An ionic liquid, polyacrylonitrile technology, applied in the direction of melt spinning, spinning solution preparation, single-component synthetic polymer rayon, etc., can solve the narrow melt spinning temperature range of hydrated melt, difficult process control, The mechanical properties of fibers are deteriorated and other problems, so as to save the solvent recovery process, equipment and water washing process, eliminate serious environmental pollution problems, and reduce production costs.

Inactive Publication Date: 2009-09-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method also has some problems: a. Because the fluidity of the hydrated melt is not good, the extrusion pressure of the screw is relatively high; This makes the mechanical properties of the fiber worse, so a certain pressure of saturated water vapor must be maintained in the spinning tunnel, which puts forward certain requirements for the equipment; Difficult to control
Therefore, it has not yet been industrialized

Method used

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  • Method for melt spinning of polyacrylonitrile PAN by taking imidazole ionic fluid as plasticizing agent
  • Method for melt spinning of polyacrylonitrile PAN by taking imidazole ionic fluid as plasticizing agent
  • Method for melt spinning of polyacrylonitrile PAN by taking imidazole ionic fluid as plasticizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, polyacrylonitrile powder and [BMIM]BF 4 Mix evenly in a high-speed mixer with a mass ratio of 1:1, and then transfer to a twin-screw spinning machine for melt spinning; the screw speed of the twin-screw spinning machine is 50r / min, and the temperature of the feed section is set to 185°C. The temperature of the plasticizing section is 190°C, the temperature of the melting section is 185°C, the aspect ratio of the spinneret is 1:3, and the hole diameter is 0.5mm. The spun filaments are subjected to primary dry heat stretching, secondary dry heat stretching, Washing, oiling, and heat setting to obtain PAN fiber. The PAN fiber strength is 2.8cN / dtex, and the elongation at break is 19.0%.

Embodiment 2

[0030] First, polyacrylonitrile powder and [EMIM]BF 4 Mix evenly in a high-speed mixer at a mass ratio of 1.2:1, and then transfer to a twin-screw spinning machine for melt spinning. Adjust the screw speed of the twin-screw spinning machine to 75r / min, the temperature of the feed section to 180°C, the temperature of the plasticizing section to 185°C, the temperature of the melting section to 180°C, the length-to-diameter ratio of the spinneret to 1:3, and the aperture to 0.5mm, the spun filaments are subjected to primary dry heat stretching, secondary dry heat stretching, washing, oiling, and heat setting to obtain PAN fibers. The PAN fiber strength is 3.6cN / dtex, and the elongation at break is 10.9%.

Embodiment 3

[0032]First, the polyacrylonitrile powder and [BMIM]Cl were mixed uniformly in a high-speed mixer at a mass ratio of 1:1, and then transferred to a twin-screw spinning machine for melt spinning. Adjust the screw speed of the twin-screw spinning machine to 70r / min, the temperature of the feed section to 185°C, the temperature of the plasticizing section to 190°C, the temperature of the melting section to 190°C, the length-to-diameter ratio of the spinneret to 1:3, and the hole diameter to be 0.5mm, the spun silk is subjected to primary dry heat stretching, secondary dry heat stretching, washing, oiling, and heat setting to obtain PAN fibers. The strength of PAN fibers is 4.0cN / dtex, and the elongation at break is 16.9 %. Figure 1 is the SEM photo of the PAN fiber cross-section after washing. figure 2 is the DMA curve of PAN fiber when PAN / [BMIM]Cl is 1:1.

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Abstract

The invention relates to a method for melt spinning of polyacrylonitrile PAN by taking imidazole ionic fluid as a plasticizing agent. The method comprises the following steps: (1) evenly mixing polyacrylonitrile powder which is dried to an anhydrous state with ionic fluid; (2) adding the mixture into a hopper of a double-screw spinning machine, regulating the rotating speed of screws of between 40 and 120 revolutions / minute, setting the spinning temperature of between 170 and 220 DEG C, and carrying out melt spinning; directly carrying out dry heat stretching on filament which is spun by a spinneret plate without water bath with stretching temperature of between 80 and 180 DEG C and stretching times of between 1 and 8 times; and (3) washing the stretched fiber with water, and carrying out heat setting and winding on the fiber to obtain the polyacrylonitrile fiber. The method has low cost, reduces environmental pollution, and is applicable to industrial production; and the produced fiber can be subjected to super stretching, has a section without a cavity structure, and improves the strength.

Description

technical field [0001] The invention belongs to the field of polyacrylonitrile melt spinning, in particular to a polyacrylonitrile PAN melt spinning method in which imidazole-type ionic liquid is used as a plasticizer. Background technique [0002] One of the main properties of polyacrylonitrile resin is its high melting point (317°C), which decomposes before melting when heated. Therefore, polyacrylonitrile fibers can only be produced by solution spinning. Industrialized wet spinning and dry spinning all use a large amount of toxic or corrosive chemical solvents, and solvent recovery and purification, fiber washing and drying, and "three wastes" treatment must be carried out during the production process. If the melt spinning of polyacrylonitrile fiber can be realized, it will not only save solvent consumption, but also save solvent recovery process and equipment and water washing process, which can greatly reduce production costs and eliminate serious environmental polluti...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01D1/02D01D10/00D01D10/02D01D10/06D01F6/54
Inventor 余木火王兆华韩克清荣怀苹张毅炜滕翠青邓智华
Owner DONGHUA UNIV
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