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Preparation method of aramid fiber nanofiber aerogel

A nanofiber and aramid fiber technology is applied in the field of aerogel preparation, which can solve the problems of poor heat resistance and poor mechanical strength of aerogels, and achieve the effects of ideal heat resistance, ideal mechanical strength and high modulus.

Active Publication Date: 2017-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor mechanical strength and poor heat resistance of existing aerogels, and provide a method for preparing aramid nanofiber aerogels

Method used

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  • Preparation method of aramid fiber nanofiber aerogel
  • Preparation method of aramid fiber nanofiber aerogel

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specific Embodiment approach 1

[0024] Specific embodiment 1: This embodiment is a preparation method of aramid nanofiber aerogel, which is specifically completed according to the following steps:

[0025] 1. Extraction: Using acetone as the extraction solvent, the aramid fiber is extracted and treated with a Soxhlet extractor for 48h to 72h to obtain the extracted aramid fiber; then the extracted aramid fiber is heated at a temperature of Vacuum drying in a vacuum drying oven at 40℃~90℃ for 12h~72h to obtain dry aramid fibers;

[0026] 2. Use nitrogen to purge the dry three-necked flask for 20min-30min, then add dimethyl sulfoxide, potassium hydroxide and dried aramid fiber to the three-necked flask, and then stir at a stirring speed of 500r / min~1300r / min The reaction is stirred for 3 to 10 days to obtain a dark red aramid nanofiber solution;

[0027] The mass ratio of the dry aramid fiber described in step 2 to the volume ratio of dimethyl sulfoxide is (0.5g~2g): 500mL;

[0028] The quality of potassium ...

specific Embodiment approach 2

[0041] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the temperature of the extraction process described in step 1 is 50°C to 130°C. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0042]Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the aramid fiber described in step 1 is one of Kevlar fibers of 50 denier to 1600 denier or a mixed fiber of several of them. . Other steps are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of an aramid fiber nanofiber aerogel, in particular to a preparation method of the aerogel. The invention aims to solve the problems of poor mechanical strength and poor heat resistance of an existing aerogel. The preparation method comprises the steps of (1) extracting; (2) preparing a dark red aramid fiber nanofiber solution; (3) preparing an aramid fiber nanofiber hydrogel; (4) carrying out vacuum filtration and cleaning; (5) freeze drying to obtain the aramid fiber nanofiber aerogel. According to the aramid fiber nanofiber aerogel prepared through the preparation method provided by the invention, the temperature of primary thermal decomposition is 500 DEG C, so that the aramid fiber nanofiber aerogel can be used in a temperature interval ranging from 200 DEG C to 500 DEG C for a long time; the tensile strength of the aramid fiber nanofiber aerogel prepared through the preparation method provided by the invention reaches to 230 MPa. The invention discloses the preparation method of the aramid fiber nanofiber aerogel.

Description

technical field [0001] The present invention relates to a preparation method of aerogel. Background technique [0002] Kevlar fiber is a high-performance para-aramid fiber developed by DuPont in the United States. Its chemical name is poly-p-phenylene terephthalate (PPTA). Kevlar fiber is a high-performance linked benzamide, the amide bond and the benzene ring group form a conjugated structure, the molecular arrangement is regular, the orientation degree and fiber cleanliness are high, the chain segment is arranged regularly, and there is a strong intermolecular hydrogen bond. Factors endow the fiber with excellent properties such as high strength, high modulus, and high temperature resistance. [0003] Aerogels are one of the least dense synthetic materials known to date, and have attracted extensive attention due to their extremely small apparent density and thermal conductivity, high porosity and specific surface area. However, the porous structure and extremely low den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/09C08L77/10
Inventor 黄玉东王芳吴亚东马丽娜谢非
Owner HARBIN INST OF TECH
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