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Method for preparing black para-aramid fibers

A para-aramid fiber, black technology, applied in the field of preparation of black para-aramid fiber, can solve the problems of reducing mechanical properties, reducing PPTA molecular force, complex interface, etc., and achieve the effect of improving color fastness

Active Publication Date: 2016-06-22
AFCHINA CORP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these methods are to add additives to give color to aramid fiber, so it will have a negative impact on the performance of para-aramid fiber
Small molecule dyes play a plasticizing role between PPTA molecules, so they will reduce the intermolecular force of PPTA and reduce its mechanical properties; and the addition of additives such as carbon nanotubes is more difficult because of its complex interface and weak interaction. Reduce the mechanical properties of para-aramid fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of black line para-aramid fiber, comprises the following steps:

[0022] (1) The NMP solution dissolved with the solubilizing salt calcium chloride is cooled to 0°C, and the mass percentage of the solubilizing salt is 10%; under the protection of nitrogen, add p-Phenylenediamine and gradually cool it down to 0°C, the molar concentration of p-Phenylenediamine in the solvent system is 0.4mol / L; the monomer TPC is stored in a storage tank at a temperature of 90°C, and is followed up in the form of a melt operate;

[0023] (2) Continuously and accurately measure the PPD solution and the TPC melt respectively and continuously transport them to the mixer through the delivery pump for mixing, PPD:TPC=1:1.007 (molar ratio); the mixed liquid directly enters the double Polymerization was carried out in a screw reactor; the screw length-to-diameter ratio of the twin-screw reactor was 65:1, and the rotation speed was 100 rpm. The screw temperature was...

Embodiment 2

[0029] A kind of preparation method of black line para-aramid fiber, comprises the following steps:

[0030] (1) The NMP solution that is dissolved with the dissolution-promoting salt lithium chloride is cooled to 15° C., and the mass percentage of the solubilizing salt is 12%; The diamine was dissolved and it was gradually cooled to 0°C. The molar concentration of p-phenylenediamine in the solvent system is 0.3mol / L; the monomer TPC is stored in a storage tank at a temperature of 100°C, and is subsequently operated in the form of a melt;

[0031] (2) The PPD solution and the TPC melt are continuously and accurately metered respectively and continuously transported to the mixer by the delivery pump for mixing, PPD:TPC=1:1.003 (molar ratio). The mixed liquid directly flows into the twin-screw reactor for polymerization; the screw length-to-diameter ratio of the twin-screw reactor is 45:1, and the rotation speed is 50rpm; the screw temperature is controlled at 70°C;

[0032] (...

Embodiment 3

[0037] A kind of preparation method of black line para-aramid fiber, comprises the following steps:

[0038] (1) The NMP solution dissolved with the solubilizing salt calcium chloride is cooled to 0°C, and the mass percentage of the solubilizing salt is 8%; under the protection of nitrogen, add phenylenediamine and gradually cool it down to 0°C, the molar concentration of p-phenylenediamine in the solvent system is 0.4mol / L; the monomer TPC is stored in a storage tank at a temperature of 90°C, and subsequent operations are carried out in the form of a melt ;

[0039] (2) Continuously and accurately measure the PPD solution and the TPC melt respectively and continuously transport them to the mixer through the delivery pump for mixing, PPD:TPC=1:1.003 (molar ratio); the mixed liquid directly enters the double Polymerization was carried out in a screw reactor; the screw length-to-diameter ratio of the twin-screw reactor was 65:1, and the rotation speed was 100 rpm. The screw te...

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Abstract

The invention belongs to the field of technologies for synthesizing macromolecules, and particularly relates to a method for preparing black para-aramid fibers. The method has the advantages that a little oxidized p-phenylenediamine is added into PPTA (poly-p-phenylene terephthamide) to stain the PPTA by the aid of a characteristic that p-phenylenediamine is easy to oxidize and turn black, other auxiliaries are omitted, accordingly, processes for producing the black para-aramid fibers can be simplified, and the mechanical properties of the para-aramid fibers can be guaranteed against being obviously damaged; the addition amount of the oxidized p-phenylenediamine can be adjusted, so that the para-aramid fibers with colors from black, brown and even coffee colors can be prepared by the aid of the method.

Description

technical field [0001] The invention relates to a method for preparing black para-aramid fiber, which belongs to the technical field of polymer synthesis. Background technique [0002] Para-aramid fiber is a high-performance fiber with many advantages such as high strength and high modulus, high temperature resistance and chemical corrosion resistance, and is widely used in national defense and civilian fields. However, due to the special skin-core structure of para-aramid fiber, its adhesion with other materials is poor, which affects the performance of its composite material. In addition, para-aramid fibers contain a large number of aramid groups, are sensitive to ultraviolet rays, and their performance decreases significantly under ultraviolet irradiation. Therefore, improving the above-mentioned shortcomings of para-aramid fibers has become a key issue. Among them, making para-aramid fiber into black fiber is an effective means. [0003] So far, there have been many re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/80C08G69/28C08G69/32
CPCC08G69/28C08G69/32D01F6/805
Inventor 庹新林崔庆海
Owner AFCHINA CORP CO LTD
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