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A kind of preparation method of aramid fiber nanofiber airgel

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

Active Publication Date: 2019-10-08
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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  • A kind of preparation method of aramid fiber nanofiber airgel
  • A kind of preparation method of aramid fiber nanofiber airgel

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specific Embodiment approach 1

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

[0025] 1. Extraction: Use acetone as the extraction solvent, and use a Soxhlet extractor to extract the aramid fiber for 48h to 72h to obtain the extracted aramid fiber; then extract the aramid fiber at a temperature of Vacuum drying in a vacuum drying oven at 40°C to 90°C for 12h to 72h to obtain dried aramid fibers;

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

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

[0028] The mass of potassium hydroxide describ...

specific Embodiment approach 2

[0041] Embodiment 2: This embodiment differs from Embodiment 1 in that: the temperature of the extraction treatment 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 mixture of several of them . Other steps are the same as those in Embodiment 1 or 2.

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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 invention relates to a preparation method of airgel. Background technique [0002] Kevlar fiber is a high-performance para-aramid fiber developed by DuPont of the United States, and its chemical name is poly-p-phenylenediamine terephthalate (PPTA). Kevlar fiber is a high-performance linking 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 segments are arranged regularly, and there is a strong intermolecular hydrogen bond. The factors endow the fiber with excellent characteristics such as high strength, high modulus, and high temperature resistance. [0003] Aerogel is one of the lowest-density synthetic materials known so far, and has attracted extensive attention because of its extremely small apparent density and thermal conductivity, high porosity and specific surface area. However, the porous structure and ex...

Claims

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Application Information

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Patent Type & Authority Patents(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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