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A kind of preparation method and application of oil-dispersed aramid fiber nanofiber

A nanofiber and oil dispersion technology, applied in fiber types, fiber treatment, textiles and papermaking, etc., can solve the problems of limiting the application of aramid nanofibers, precipitation of aramid nanofibers, and inability to store aramid nanofiber solutions for a long time. Achieve the effect of enhancing storage stability, not easy to gather or coagulate to form precipitation, and easy to industrialized production

Active Publication Date: 2016-08-24
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the aramid nanofibers prepared by the above method can only exist under strong alkali conditions. When the dispersion becomes neutral or weakly alkaline, the nitrogen atoms regain hydrogen atoms, the hydrogen bonds between the nanofibers are re-formed, and the fibers gather again.
Moreover, the aramid nano-solution prepared by the above method cannot be stored for a long time. In humid air, DMSO is easy to absorb water, thereby causing aramid nano-fibers to coagulate and form precipitation
At present, Kevlar nanofibers can only be dispersed in DMSO under alkaline conditions, which greatly limits the application of aramid nanofibers

Method used

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  • A kind of preparation method and application of oil-dispersed aramid fiber nanofiber
  • A kind of preparation method and application of oil-dispersed aramid fiber nanofiber

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Embodiment 1

[0033] A method for preparing water-dispersed aramid nanofibers of the present embodiment, the specific preparation steps are as follows:

[0034] (1) Add 60ml of dimethyl sulfoxide (DMSO) and 1g of Kevlar fiber (provided by Dupont) into a round-bottomed flask, then add methanol and potassium tert-butoxide, heat to 30°C and magnetically stir for 2 days to disperse evenly. The amount of methanol added is 100% of the molar weight of the amide bond unit in the Kevlar fiber, and the added amount of potassium tert-butoxide is 60% of the molar weight of the amide bond unit in the Kevlar fiber.

[0035] (2) Add propyne bromide to the solution in step (1), react at 30°C for 16 hours, the color of the solution becomes lighter, and the viscosity decreases, then add water to the reaction system to precipitate the product, centrifuge to obtain the product, wash with water for 3 ~ 5 times and freeze-drying to obtain aramid nanofibers with active functional groups on the surface, wherein th...

Embodiment 2

[0039] A method for preparing water-dispersed aramid nanofibers of the present embodiment, the specific preparation steps are as follows:

[0040] (1) Add 60ml of dimethyl sulfoxide (DMSO) and 1g of Kevlar fiber (provided by Dupont) into a round-bottomed flask, then add methanol and potassium hydride, heat to 30°C and magnetically stir for 2 days to disperse evenly, and obtain black-red A uniform transparent aramid nanofiber solution, wherein the added amount of methanol is 200% of the molar amount of the amide bond unit in the Kevlar fiber, and the added amount of potassium hydride is 100% of the molar amount of the amide bond unit in the Kevlar fiber.

[0041] (2) Add chlorinated propyne to the solution in step (1), react at 30°C for 16 hours, the color of the solution becomes lighter, and the viscosity decreases, then add water to the reaction system to precipitate the product, centrifuge to obtain the product, wash with water for 3 ~ 5 times and freeze-drying to obtain arami...

Embodiment 3

[0045] A method for preparing water-dispersed aramid nanofibers of the present embodiment, the specific preparation steps are as follows:

[0046] (1) Add 60ml of N,N-dimethylformamide (DMF) and 1g of Kevlar fiber (provided by Dupont) into a round bottom flask, then add water and sodium hydroxide, heat to 40°C and stir magnetically for 3 days to disperse Uniform, black-red homogeneous transparent aramid nanofiber solution is obtained, wherein the addition of water is 400% of the molar weight of the amide bond unit in the Kevlar fiber, and the addition of sodium hydroxide is 300% of the molar weight of the amide bond unit in the Kevlar fiber.

[0047] (2) Add 5-chloro-1-pentyne to the solution in step (1), react at 30°C for 16 hours, the color of the solution becomes lighter and the viscosity decreases, then add water to the reaction system to precipitate the product, and centrifuge to obtain the product, Washing with water for 3 to 5 times, freeze-drying to obtain aramid nanof...

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Abstract

The invention belongs to the technical field of polymer nanomaterials and discloses an oil-dispersing nano-aramid fiber, as well as a preparation method and an application of the oil-dispersing nano-aramid fiber. The preparation method comprises the following preparation steps: putting an organic solvent, a Kevlar fiber, a catalyst and alkali in a container, heating, mixing, and dispersing uniformly to form nano-aramid fiber dispersoid, adding active functional group organic micromolecules capable of carrying out nucleophilic reaction with nitranions into the dispersoid to form a nano-aramid fiber with an active functional group on the surface, and then allowing the nano-aramid fiber to react with an active oil-soluble macromolecular compound, and separating a reaction product to form the oil-dispersing nano-aramid fiber. The nano-aramid fiber can be dispersed in an oil-soluble solvent stably, and the application scope of the nano-aramid fiber is greatly expanded.

Description

technical field [0001] The invention belongs to the technical field of polymer nanomaterials, and in particular relates to a preparation method and application of oil-dispersed aramid fiber nanofibers. Background technique [0002] Kevlar fiber is a high-performance para-aramid fiber developed by DuPont in the United States in the 1960s and industrialized in the 1970s. The chemical name of Kevlar fiber is poly-p-phenylene terephthalate (PPTA), which is called aramid-1414 in China. PPTA fiber is a crystalline structure polymer that is cross-linked in a network by PPTA molecules that are similar to rigid extended chains. Kevlar fiber is a high-performance linking benzamide. The amide bond forms a conjugated structure with the benzene ring group. The internal rotation potential energy is quite high. The macromolecular configuration is a rigid chain structure extending along the axial direction. The molecular arrangement is regular, and the degree of orientation and The fiber ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/08D06M15/263D06M15/233D06M15/227D06M101/36
Inventor 胡继文于法猛张培涂园园
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI