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A kind of aramid micro-nano fiber with dendritic structure prepared by double-jet method and its application

A technology of micro-nano fibers and dendrites, which is applied in the fields of fiber raw material treatment, fiber chemical characteristics, post-treatment modification of cellulose pulp, etc., can solve the problems of wide size distribution range, large diameter of aramid fibers, and high energy consumption of mechanical methods , to achieve the effect of improving mechanical strength and dielectric properties, large specific surface area, and improving bonding strength

Active Publication Date: 2022-05-17
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrospinning method has low production efficiency and difficult size control; the alkali fusion method needs to dissolve the aramid fiber first and then disperse the preparation, which is cumbersome; the mechanical method has high energy consumption and large power consumption; the existing jet spinning technology uses internal Liquid pipe, external air intake pipe structure, the aramid fiber prepared by it has a large diameter, the length cannot be adjusted, and the size distribution range is wide

Method used

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  • A kind of aramid micro-nano fiber with dendritic structure prepared by double-jet method and its application
  • A kind of aramid micro-nano fiber with dendritic structure prepared by double-jet method and its application
  • A kind of aramid micro-nano fiber with dendritic structure prepared by double-jet method and its application

Examples

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Effect test

Embodiment 1

[0079] A kind of high-efficiency preparation of aramid micro-nano fiber by double-jet method, its preparation method is as follows (the schematic diagram of aramid micro-nano fiber prepared by double-jet method is as follows figure 1 shown):

[0080] (1) Preparation of aramid polymer dispersion: according to mass percentage, polym-phenylene isophthalamide is dispersed in dimethylacetamide (full name N, N-dimethylacetamide, In DMAC), after being stirred by a mechanical paddle mixer, the rotating speed is 500rpm, and the stirring time is 10min. After stirring, dispersing and filtering, an aramid polymer dispersion with a mass fraction of 10% is obtained;

[0081](2) Preparation of aramid micro-nano fiber: using an atomizer device, the above-mentioned aramid polymer dispersion is subjected to gas spraying treatment through an internal gas flow and an external liquid flow, and the size of the atomization hole is 3.0mm , air is the gas source, and the gas pressure is 0.2MPa; water...

Embodiment 2

[0084] A method for efficiently preparing aramid micro-nano fibers using a double-jet method, the preparation method of which is as follows:

[0085] (1) Preparation of aramid polymer dispersion: according to the mass percentage, polym-phenylene isophthalamide is dispersed in dimethylacetamide at room temperature, stirred by a mechanical paddle mixer, and the rotating speed is 500rpm , the stirring time is 20min, after continuous stirring, dispersing and filtering, the aramid polymer dispersion with a mass fraction of 20% is obtained;

[0086] (2) Preparation of aramid micro-nano fiber: using an atomizer device, the above-mentioned aramid polymer dispersion is subjected to gas spraying treatment through an internal gas flow and an external liquid flow, and the size of the atomization hole is 3.0mm , air is the gas source, and the gas pressure is 1.0MPa; the dimethylacetamide solution with a mass fraction of 10% is used as a curing agent to carry out gas atomization treatment t...

Embodiment 3

[0089] A method for efficiently preparing aramid micro-nano fibers using a double-jet method, the preparation method of which is as follows:

[0090] (1) Preparation of aramid polymer dispersion: according to the mass percentage, polym-phenylene isophthalamide is dispersed in dimethylacetamide at room temperature, stirred by a mechanical paddle mixer, and the rotating speed is 1000rpm , the stirring time is 1min, after continuous stirring, dispersing and filtering, the aramid polymer dispersion with a mass fraction of 12% is obtained;

[0091] (2) Preparation of aramid micro-nano fiber: using an atomizer device, the above-mentioned aramid polymer dispersion is subjected to gas spraying treatment through an internal gas flow and an external liquid flow, and the size of the atomization hole is 2.0mm , air is the gas source, and the gas pressure is 0.4MPa; the dimethylacetamide solution with a mass fraction of 70% is used as a curing agent to carry out gas spraying treatment thro...

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Abstract

The invention discloses a method for preparing aramid micro-nano fibers with a dendritic structure by a double-jet method and an application thereof. The preparation method of the aramid micro-nano fiber comprises the following steps: (1) adding the aramid polymer into a dispersion solvent to obtain an aramid polymer dispersion; (2) performing gas spraying treatment on the aramid polymer dispersion At the same time, the dispersant is subjected to gas spraying treatment, and then the two jets formed by the gas spraying treatment are fully mixed and collected, and then dispersed in water for ultrasonic dispersion treatment to obtain aramid micro-nano fibers with a dendritic structure; wherein, The conditions of the gas atomization treatment are: the spinneret hole type is an inner air inlet hole and an outer liquid inlet hole, the aperture range of the atomizer is 0.1-5.0 mm, and the gas pressure range is 0.1-1.0 MPa. The micro-nano fiber prepared by the invention has a large specific surface area, can significantly improve the fiber interface bonding strength in the aramid paper, and effectively improve the mechanical strength and dielectric properties of the aramid paper.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to the preparation of aramid micro-nano fiber with a dendritic structure by a double-jet method and its application. Background technique [0002] Aramid micro-nano fiber has micro-nano-scale aramid fiber, which has the advantages of high aspect ratio, high specific surface area, excellent strength modulus, and outstanding chemical and thermal stability, and has a wide range of applications in various fields. Since 2011, it is considered as one of the most promising nano-building materials and thus has received increasing attention. At present, the technology that can be used to prepare aramid nanofibers is relatively scarce, and the technology that can be used in industrial production is even more scarce. At present, the methods for preparing aramid micro-nanofibers are mostly deprotonation method, alkali method and mechanical method according to the dissolution method, as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/60D21H13/26D21H11/18
CPCD01F6/605D21H13/26D21H11/18Y02P70/62
Inventor 李金鹏李永锋王斌常小斌曾劲松陈克复
Owner SOUTH CHINA UNIV OF TECH