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Aromatic polyamide/aromatic polyimide blended fiber and preparation method thereof

A technology of aromatic polyamide and polyimide, which is applied in the direction of stretch spinning, conjugated synthetic polymer rayon, chemical post-treatment of synthetic polymer rayon, etc., and can solve the decline in the comprehensive performance of the blend , Failure to improve performance, low mechanical properties of copolymers, etc., to achieve the effects of ensuring compatibility, improving tensile strength, and improving UV resistance

Active Publication Date: 2012-09-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports of polyamide-polyimide copolymers prepared by copolymerization (CN1449424), but unfortunately the mechanical properties of this copolymer are not high, and it is mainly used as enameled wire material
Although the method of blending is an effective way to improve the comprehensive properties of polymers, the blending needs to solve the compatibility problem between the blends, otherwise phase separation will occur between different components in the blend, resulting in The overall performance of the mixture generally declines, failing to achieve the purpose of improving performance
However, there are no reports on the blended fibers and methods of aromatic polyamides and aromatic polyimides with excellent comprehensive properties prepared by blending.

Method used

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  • Aromatic polyamide/aromatic polyimide blended fiber and preparation method thereof
  • Aromatic polyamide/aromatic polyimide blended fiber and preparation method thereof
  • Aromatic polyamide/aromatic polyimide blended fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to TPC: PABZ: PDA =100:50:50 molar ratio, first add PDA and PABZ two kinds of diamine monomers into the N-methylpyrrolidone / lithium chloride solvent system, the content of lithium chloride is 4wt%, and then Stir under the protection of nitrogen to dissolve all PDA and PABZ, cool the system to 5°C, then add TPC to the system in three batches and stir to make it continue to react for 4 hours at 25°C under nitrogen atmosphere to obtain a viscous aroma Homogeneous stock solution of polyamide polymer. The solid content of the polymer in the stock solution was 4wt%.

[0037] According to the molar ratio of BPDA:PABZ:PDA=100:50:50, two kinds of diamine monomers, PDA and PABZ, are firstly added into the metered N-methylpyrrolidone / lithium chloride solvent system, and the content of lithium chloride is 4wt%. Then stir under the protection of nitrogen to dissolve all the PDA and PABZ, cool the system down to 10°C, then add the measured BPDA into the system in three bat...

Embodiment 2

[0040] In this example, except that the aromatic polyamide polymer stock solution and the aromatic polyamic acid polymer stock solution are blended according to the polymer weight ratio of 70:30, and the thermal stretching / hot imide temperature is 450°C, the remaining fibers are prepared The process and the ratio of polyamide and polyamic acid synthesis monomers are the same as those in Example 1, so they are omitted here.

Embodiment 3

[0042] In this example, the aromatic polyamide polymer stock solution and the aromatic polyamic acid polymer stock solution are blended according to the polymer weight ratio of 50:50, and the thermal stretching / hot imide temperature is 380°C. The aromatic polyamide The molar ratio of polymerized monomers is TPC:PABZ:PDA=100:40:60, the molar ratio of aromatic polyamic acid polymerized monomers is BPDA:PABZ:PDA=100:70:30, and the reasons and implementation of other fiber preparation processes Example 1 is the same, so it is omitted.

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Abstract

An aromatic polyamide / aromatic polyimide blended fiber contains aromatic polyamide and aromatic polyimide, the tensile strength of the aromatic polyamide / aromatic polyimide blended fiber is 4.5-5.0 GPa, the tensile modulus is 142-160 GPa, and the retention rate of the tensile strength of the aromatic polyamide / aromatic polyimide blended fiber is larger than 95% after illuminated by an ultraviolet lamp for 100h. The invention further discloses a preparation method of the aromatic polyamide / aromatic polyimide blended fiber. Synthesized polymer spinning solution is high in blending compatibility and cannot be separated in the process of deaeration and spinning and the like, corresponding support is provided so that the aromatic polyamide and the aromatic polyimide can better exert a synergistic effect and demonstrate excellent performance in the blended fiber, and the high-strength high-modulus highly-ultraviolet-resistant fiber which has high mechanical strength of an aromatic polyamide fiber and high ultraviolet resistance of a polyimide fiber is obtained, and the aromatic polyamide / aromatic polyimide blended fiber can be widely applied to aeronautics and astronautics and the atomic energy industry, and in particular to the complex environments of near space fields and the like where ozone concentration is high and ultraviolet radiation is severe.

Description

technical field [0001] The invention belongs to the technical field of high-performance fiber and its preparation, and in particular relates to an aromatic polyamide / aromatic polyimide blended fiber and a preparation method thereof. Background technique [0002] Due to its high strength, modulus and high temperature resistance, high-performance fibers are widely used in aircraft, rockets, missiles and other aviation and aerospace equipment, as well as automobiles, ships, body armor, snowboards and other fields. Its typical representative is the aromatic polyamide Kevlar fiber successfully developed by DuPont in the 1970s, and since the fiber appeared, it has greatly promoted the development and application of high-strength and high-modulus fibers. At present, the development of high-strength, high-modulus and high-performance fibers is still one of the key directions in the field of fiber research. [0003] Kevlar fiber (known as aramid fiber II in China) is polyamide resin...

Claims

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Application Information

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IPC IPC(8): D01F8/12D01F8/16D01F11/08D01D5/12
Inventor 刘向阳黄杰阳王旭罗龙波庞雨微高杰姚静
Owner SICHUAN UNIV
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