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Polyamide-imide fiber wet one-step spinning process

A technology of polyamide-imide spinning and polyamide-imide, which is applied in the field of polymer fiber preparation, can solve the problems of complex fiber forming and achieve the effects of eliminating brittleness, low cost and easy control

Active Publication Date: 2014-04-30
JIANGSU JUXIAN SYNTHETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the particularity of the molecular structure of polyamide-imide, the fiber formation in the spinning process is complicated, and there have been few reports on the direct spinning process.

Method used

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  • Polyamide-imide fiber wet one-step spinning process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A polyamide-imide fiber wet one-step spinning process, the specific steps are: the polyamide-imide slurry with a solid content of 15% and a viscosity of 6.3w mPa.s (37 ° C) is placed in a storage tank at 40 Stand at ℃ for defoaming for 12 hours, use a metering pump to accurately measure the amount of slurry, and then pass through the spinning assembly, the first drawing machine, the coagulation bath, the second drawing machine, the plasticizing drawing bath, the third drawing machine, water After bathing and the fourth drafting machine, dry and wind up to obtain polyamideimide virgin fibers. Wherein, the solvent of polyamide-imide spinning slurry is DMAc, and the spinneret hole number of spinning assembly is 25 holes, and diameter is 0.1mm, and described first coagulation bath is made of DMAc75wt%, CaCl 2 12wt%, water 13wt%, the first coagulation bath temperature 35 ° C, the second coagulation bath by DMAc70wt%, CaCl 2 12wt%, water 18wt%, second coagulation bath temper...

Embodiment 2～6

[0037] Similar to Example 1, the difference is that process parameters are different, specifically as shown in the following table (each concentration in the table is all weight concentration):

[0038] Table 1 embodiment 2~6 polyamideimide fiber spinning forming process parameters

[0039]

Embodiment 7～15

[0041] The raw polyamideimide fibers obtained in Examples 1 to 6 were thermally stretched at a certain draw ratio at 290 to 430°C to obtain polyamideimide filament fibers, and their mechanical properties were tested. Test, see Table 2 below for details.

[0042] Table 2 embodiment 7~15 polyamide-imide fiber thermal stretching process parameters and filament-forming mechanical properties

[0043] Example

[0044]

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Abstract

The invention provides a polyamide-imide fiber wet one-step spinning process. The process is characterized by including the steps: defoaming polyamide-imide spinning dope in a storage tank by standing, metering usage of the dope by a metering pump, spinning with a spinning unit, and subjecting obtained yarns to batching with first coagulating bath, second coagulating bath, plastic drafting bath and water and then dried to obtain primary fiber of polyamide-imide. The first coagulating bath is composed of 60-80wt% of aprotic polar solvent, 5-20wt% of CaCl2, and the balance of water; the second coagulating bath is composed of 50-80wt% of aprotic polar solvent, 5-20wt% of CaCl2, and the balance of water; the concentration of the aprotic polar solvent in the second coagulating bath is lower than that of the aprotic polar solvent in the first coagulating bath. Filament fiber obtained by the process has high mechanical properties. The polyamide-imide fiber wet one-step spinning process has the advantages that equipment is simple, control is simple and cost is low.

Description

technical field [0001] The invention belongs to the field of polymer fiber preparation, in particular to a polyamideimide fiber wet one-step spinning process. Background technique [0002] Polyamide-imide (PAI) was first developed by American Amo Company in 1964 to improve the processability of polyimide, because its molecular structure also contains a heat-resistant aromatic heterocycle The imine group and flexible amide group make it have excellent physical and chemical properties such as creep resistance, dimensional stability, high temperature resistance, high strength, wear resistance, electrical insulation, and radiation resistance. [0003] Textile fibers made of polyamide-imide have become emerging high-tech synthetic fibers due to their above-mentioned properties, and can be used in structural composite materials, fire safety, filtration and dust removal, sporting goods and other industries. [0004] At present, the spinning processing methods of chemical fibers in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01D5/14D01D10/02D01F6/78
Inventor 李文彬毛志平张德国王军李栋
Owner JIANGSU JUXIAN SYNTHETIC MATERIAL
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