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A preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly

A layer-by-layer self-assembly, vacuum-assisted technology, applied in the field of material preparation, can solve the problems of difficult film formation and time-consuming nano-aramid film, and achieve the effects of excellent performance, reduced introduction and simple operation.

Active Publication Date: 2020-12-01
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a nano-aramid film based on vacuum-assisted layer-by-layer self-assembly, which solves the problems that the existing LBL method takes a long time to prepare a nano-aramid film and is difficult to form a film

Method used

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  • A preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly
  • A preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly
  • A preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly

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preparation example Construction

[0018] A kind of preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly provided by the invention comprises steps:

[0019] Weigh potassium hydroxide (KOH) and para-aramid chopped fiber (PPTA) according to the mass ratio of 3:2 and add them to dimethyl sulfoxide (DMSO) solution, and add the sum of KOH and PPTA to DMSO The ratio of the solution is 1g / (200-500)ml, that is, the sum of KOH and PPTA dissolved in every 200-500ml of DMSO solution is 1g, and then stirred at room temperature at a speed of 600-800 rpm for 7 days or 7 days Obtain dark red para-aramid chopped nanofiber (aramid nano-fiber, be called for short ANF) suspension; Then configuration mass fraction is 1% polydiallyl dichloromethylammonium (PDDA) solution, Then take an equal volume of ANF suspension and PDDA solution at intervals and use a vacuum filter bottle to carry out layer-by-layer assembly by vacuum filtration. After assembly, use deionized water and ethanol to wash sep...

Embodiment 1

[0026] A kind of preparation method of the nano-aramid film based on vacuum-assisted layer-by-layer self-assembly of the present embodiment comprises the steps: after weighing 0.3g KOH and 0.2g PPTA respectively, add them in 100ml dimethyl sulfoxide (DMSO) solution, and then Stir at room temperature at a speed of 600 rpm for 12 days to obtain a dark red ANF suspension; then configure 80ml of PDDA solution with a mass fraction of 1%, and then take 20ml of ANF suspension and 20ml of PDDA solution at intervals for use The vacuum filter bottle is assembled layer by layer by vacuum filtration. After assembly, it is washed with deionized water and ethanol respectively, and finally it is pressed and air-dried at room temperature to obtain a nano-aramid film. During the pressing process, the pressing pressure is 4 MPa, and the pressing time is 10 min.

[0027] Of course, it can also be understood that the volume fractions of the volumes of the ANF suspension and PDDA solution weighed ...

Embodiment 2

[0029] A kind of preparation method of nano-aramid film based on vacuum-assisted layer-by-layer self-assembly of the present embodiment comprises the steps: adding 0.3g KOH and 0.2g PPTA to 140ml dimethyl sulfoxide (DMSO) solution after weighing respectively, and then Stir at room temperature at a speed of 650 rpm for 10 days to obtain a dark red ANF suspension; then configure 120ml of PDDA solution with a mass fraction of 1%, and then take 20ml of ANF suspension and 20ml of PDDA solution at intervals for use The vacuum filter bottle is assembled layer by layer by vacuum filtration. After assembly, it is washed with deionized water and ethanol respectively, and finally it is pressed and air-dried at room temperature to obtain a nano-aramid film. During the pressing process, the pressing pressure was 3.5 MPa, and the pressing time was 11 minutes.

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Abstract

The invention discloses a preparation method of a nano aramid film based on vacuum auxiliary layer-by-layer self-assembly. The preparation method comprises the steps of: adding potassium hydroxide andpara-aramid chopped fibers into a dimethyl sulfoxide solution, stirring at a room temperature to form a para-aramid chopped nanofiber suspension, preparing a poly dimethyl diallyl ammonium chloride solution, taking the same volume of the para-aramid chopped nanofiber suspension and the poly dimethyl diallyl ammonium chloride solution for layer-by-layer assembly in a vacuum filtration manner at intervals, cleaning with deionized water and alcohol after assembly, and performing pressing and room temperature airing at last to form the nano aramid film. The aramid nano film with excellent performance is prepared by the vacuum auxiliary layer-by-layer self-assembly method; the method is simple to operate and very high in efficiency; the number of replications is greatly reduced; at the same time, the introduction of other ingredients can be greatly reduced; the excellent performance of the nano aramid fibers is fully exerted; and the development and application of the aramid nano film in other material fields are broadened.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a nano-aramid film based on vacuum-assisted layer-by-layer self-assembly. Background technique [0002] Para-aramid fiber, that is, polyparaphenylene terephthalamide (PPTA) fiber, is a quasi-reticular cross-linked near-high polymer with high strength, high modulus, high temperature resistance, corrosion resistance, etc. Excellent performance, it can be used as high-strength, lightweight honeycomb structure material, high-temperature-resistant insulating material and high-performance electronic communication equipment material, so it is widely used in many fields such as aerospace, transportation, power, national defense and military, etc. In modern industry occupies an important position. However, due to the high degree of molecular chain orientation and high crystallinity on the surface of aramid (chopped) fibers, the large steric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L77/06C08L39/00
CPCC08J5/18C08J2377/06C08J2439/00
Inventor 陆赵情司联蒙张美云赵永生谢璠花莉杨斌宋顺喜
Owner SHAANXI UNIV OF SCI & TECH