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Functionalized aramid fiber ultra-fine fibers and preparation method and application thereof

A superfine fiber and functionalization technology, applied in the direction of fiber chemical characteristics, rayon manufacturing, textiles and paper making, etc., can solve the problems of poor heat resistance of fibers

Active Publication Date: 2019-03-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the proportion of mPEG segment, the better the dispersion, but the lower the molecular weight of the polyamide segment, the worse the heat resistance of the fiber. Therefore, mPEG-modified nanofibers are mainly used in functional films, insulating paper and other fields, while It is difficult to play a role in the fields of high temperature resistance, high performance thermosetting resin and carbon fiber reinforced multi-scale composite materials such as reinforcement and toughening

Method used

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  • Functionalized aramid fiber ultra-fine fibers and preparation method and application thereof
  • Functionalized aramid fiber ultra-fine fibers and preparation method and application thereof
  • Functionalized aramid fiber ultra-fine fibers and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1～5

[0070] Synthesis of polyamic acid: add solvent and aromatic diamine into the reaction kettle according to the monomers and their contents defined in Table 1 below and stir evenly, then add aromatic diacid anhydride monomer and stir to complete the reaction to obtain a polyamic acid solution . The weight average molecular weight of polyamic acid is tested by GPC method.

[0071] Table 1

[0072]

[0073] Note: DMF: N,N-dimethylformamide; DMAc: N,N-dimethylacetamide; Py: pyridine; PMDA: pyromellitic anhydride; NTCDA: 1,4,5,8-naphthalene tetracarboxylic anhydride Formic anhydride; ODTA: 4,4'-oxydiphthalic anhydride; BTDA: 3,3',4,4'-benzophenone tetracarboxylic dianhydride; BPDA: biphenyltetracarboxylic dianhydride; PTCD: Perylenetetracarboxylic anhydride; PPD: p-phenylenediamine; DABSA: 2,5-diaminobenzenesulfonic acid; BDDA: 2,5-diamino-1,4-dihydroxybenzene; BDSA: benzidine disulfonic acid; ,5-DABA: 2,5-diaminobenzoic acid; 2,5-DATA: 2,5-diaminoterephthalic acid; DADHAQ: 1,...

Embodiment 6～11

[0075] Low-temperature solution polycondensation reaction to produce substituted polyamide: add solvent, acid absorbent, salt and aromatic diamine into the reaction kettle according to the monomers and their contents defined in Table 2 below and stir evenly, then add aromatic diacid chloride and stir to react After completion, add water to precipitate, wash with water, filter and dry to obtain a substituted polyamide.

Embodiment 12～18

[0077] High-temperature solution polycondensation reaction to produce substituted polyamide: add solvent, acid absorbent, condensing agent, salt and aromatic diamine into the reaction kettle according to the monomers and their content and reaction conditions defined in Table 2, and stir evenly, then After adding the aromatic diacid and stirring to complete the reaction, add water to precipitate, wash with water, filter and dry to obtain the substituted polyamide.

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Abstract

The invention discloses functionalized aramid fiber ultra-fine fibers and a preparation method and application thereof. The preparation method comprises the following steps: taking a multifunctional polymer with sulfonic acid, phosphoric acid, carboxylic acid, hydroxyl, phenolic hydroxyl and pyridyl as a dispersing agent, and carrying out low-temperature solution polymerization on aromatic diacylchloride and aromatic diamine in an organic solvent which contains an acid absorbent to obtain aramid fiber ultra-fine fibers which are easy to disperse and have active functional groups on the surface; and mixing the functionalized aramid fiber ultra-fine fibers with epoxy resin and a curing agent, and curing to obtain a high-performance thermosetting nano composite material. By the method, the aramid fiber ultra-fine fibers can be synthesized on a large scale, the diameters of the fibers can be effectively controlled to be 100 nanometers or below, the obtained aramid fiber ultra-fine fibersare easy to disperse in a thermosetting or thermoplastic polymer, the interface interaction is high, and the strength and toughness of the material can further be greatly improved.

Description

technical field [0001] The invention relates to the field of new polymer materials, in particular to a functionalized aramid superfine fiber and its preparation method and application. Background technique [0002] Polyparaphenylene terephthalamide (PPTA) para-aramid superfine fiber (trade name Kevlar) has been widely used in the fields of national defense and military industry and civilian industry. In recent years, para-aramid nanofibers (Aramid Nanofibers, aramid microfibers) have been used as a new type of high-performance aramid microfibers following carbon nanotubes, carbon-functionalized aramid microfibers and other inorganic functionalized aramid microfibers. Functionalized aramid microfibers have received extensive attention from academia. [0003] However, the research on the application of aramid microfibers in the fields of high-performance, high-temperature-resistant thermosetting resins and carbon fiber composites is basically blank. At the same time, the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/90D01F1/10D01F6/60C08G69/32C08J5/04C08L63/00
CPCC08G69/32C08J5/046C08J2363/00C08J2477/10D01F1/10D01F6/605D01F6/905
Inventor 彭懋周国栋王伟涛
Owner ZHEJIANG UNIV
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