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Preparation method for aromatic copolyamide fibers

A technology of copolyamide and aromatic, which is applied in the field of preparation of aromatic copolyamide fiber, and can solve the problem of unsuitable carcinogenesis

Inactive Publication Date: 2013-02-13
曹煜彤 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the carcinogenic effect of HMPA solvent, it is not suitable for industrial use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of aromatic copolyamide fiber is as follows:

[0034] Into a 5000L jacketed stainless steel reactor, inject 240g of calcium chloride (CaCl 2 ) of N-methylpyrrolidone (NMP) solution 2760g, 12.96g of p-phenylenediamine (PPDA) and 63g of 5(6)-amino-2-(4-aminophenyl)benzimidazole were added at 15°C , make it fully dissolved, slowly add 81.2g of terephthaloyl chloride (TPC), stir and react the aromatic copolyamide solution under the protection of nitrogen; add the aromatic copolyamide solution with a diameter of φ25mm and an aspect ratio of 1:48 1. Continue the polycondensation reaction at 30° C. in a co-rotating intermeshing twin-screw extruder with a rotation speed of 90 rpm to obtain a spinning dope with a dynamic viscosity of 80,000 centipoise, and the inherent viscosity of the aromatic copolyamide is 6.3.

[0035] The above-mentioned spinning stock solution is degassed by a degassing continuous degassing device, filtered and metered by a metering...

Embodiment 2

[0037] The preparation method of aromatic copolyamide fiber is as follows: in 5000L stainless steel reactor with jacket, inject 240g calcium chloride (CaCl 2 ) of N-methylpyrrolidone (NMP) solution 2760g, 12.96g of p-phenylenediamine (PPDA), 31.5g of 5(6)-amino-2-(4-aminophenyl)benzo Imidazole, 20.09g of o-chloro-p-phenylenediamine, make it fully dissolved, slowly add 81.2g of terephthaloyl chloride (TPC), stir and react the aromatic copolyamide solution under nitrogen protection; add the aromatic copolyamide solution In a co-rotating intermeshing twin-screw extruder with a diameter of φ25mm, an aspect ratio of 1:48, and a rotational speed of 90rpm, the polycondensation reaction was continued at 30°C to obtain a spinning stock solution with a dynamic viscosity of 95,000 centipoise, aromatic copolymerization The inherent viscosity of the amide is 6.6.

[0038] The above-mentioned spinning stock solution is degassed by a decompression continuous degassing device, filtered and m...

Embodiment 3

[0040] The preparation method of aromatic copolyamide is as follows:

[0041] In a 5000L jacketed stainless steel reactor, inject 240g of lithium chloride (LiCl) in N-methylpyrrolidone (NMP) solution 2760g, add 19.44g of p-phenylenediamine (PPDA) at 15°C, 94.5g 5(6)-amino-2-(4-aminophenyl) benzimidazole, make it fully dissolved, slowly add 121.8g of terephthaloyl chloride (TPC), stir and react aromatic copolyamide under nitrogen protection Solution: Add the aromatic copolyamide solution into a co-rotating intermeshing twin-screw extruder with a diameter of φ25mm, an aspect ratio of 1:48, and a rotational speed of 90rpm to continue the polycondensation reaction at 30°C to obtain a dynamic viscosity of 110,000 centimeters The inherent viscosity of aromatic copolyamide is 6.32 for the spinning dope of poise.

[0042] The above-mentioned spinning stock solution is degassed by a degassing continuous degassing device, filtered and metered by a metering pump, and then passed through...

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Abstract

The present invention relates to a preparation method for aromatic copolyamide fibers. According to the preparation method, p-phenylenediamine, one or two diamine monomers and terephthaloyl chloride are adopted to carry out a low temperature solution polymerization reaction in a cosolvent-containing amide solvent system to prepare an aromatic copolyamide solution with a solid content of 2-10%, and the solution is sequentially subjected to deaeration, filtration, spinning, water washing, drying and oiling to prepare the newborn aromatic copolyamide fibers, wherein a breaking strength is 9-16 cN / detx, an elastic modulus is 300-450 cN / detx, and after the newborn aromatic copolyamide fibers are subjected to a heat treatment for 20-60 min at a temperature of 300-500 DEG C under a vacuum condition, the obtained fibers have a breaking strength of 25-35 cN / detx and an elastic modulus of 950-1350 cN / detx.

Description

Technical field: [0001] The invention relates to a method for preparing aromatic copolyamide fibers, in particular to a spinning and heat treatment method for aromatic copolyamide fibers. In the method, the aromatic copolyamide solution is directly spun into nascent aromatic copolyamide fibers, and the nascent aromatic copolyamide fibers are properly heat-treated to obtain high-strength, high-modulus, and high-temperature-resistant aromatic copolyamide fibers. Background technique: [0002] The specific strength of aromatic copolyamide fibers is 5-6 times that of steel wire, the specific modulus is 2-3 times that of steel wire, and it can withstand high temperatures of 400 °C. Due to its excellent performance, it is gradually becoming the preferred matrix material for composite materials in aerospace, military and other fields. Its epoxy composite materials have been successfully used in solid rocket motor shells, tank armor plates, etc. Armos produced in Russia The fibe...

Claims

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Application Information

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IPC IPC(8): D01F6/80C08G69/32D01D1/10D01D5/06D01D5/14D01D10/02
Inventor 曹煜彤周助胜张浩刘兆峰胡盼盼
Owner 曹煜彤
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