Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aramid nanofiber-based composite aerogel and preparation method thereof

A composite airgel and nanofiber technology, which is applied in the field of aramid nanofiber-based composite aerogel and its preparation, can solve the problems of aramid nanofiber aerogels such as easy shrinkage, poor structural regularity, and difficult to stabilize performance. Achieve good compression cycle and mechanical properties, low thermal conductivity, and avoid shrinkage

Inactive Publication Date: 2021-08-20
SHAANXI UNIV OF SCI & TECH
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the present invention provides an aramid nanofiber-based composite aerogel and a preparation method thereof, so as to solve the problem that the aramid nanofiber aerogel is easy to shrink during the preparation process, resulting in poor structural regularity , technical problems that make its performance difficult to stabilize

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aramid nanofiber-based composite aerogel and preparation method thereof
  • Aramid nanofiber-based composite aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing an aramid nanofiber-based composite airgel, comprising the following steps:

[0027] Step 1, preparing aramid nanofiber suspension; wherein, the preparation process of aramid nanofiber suspension is as follows:

[0028] Put aramid, dimethyl sulfoxide, potassium hydroxide and water in a container, stir and disperse to obtain aramid nanofibers; mix aramid nanofibers with water to obtain aramid nanofiber suspensions; preferably, aramid The fiber adopts polyparaphenylene terephthalamide.

[0029] Step 2, mixing the aramid nanofiber suspension with the polymer solution to obtain a mixed slurry; in the mixed slurry, the mass concentration of the aramid nanofiber suspension is 0.05%-5%; the quality of the polymer solution is aramid fiber 0.5%-30% of the nanofiber mass; wherein, the polymer solution is one of PVA solution, starch solution, chitosan solution and sodium alginate solution;

[0030] Step 3, freeze-drying the mixed slu...

Embodiment 1

[0033] This embodiment 1 provides a method for preparing an aramid nanofiber-based composite airgel, comprising the following steps:

[0034] Step 1, preparation of aramid nanofiber suspension

[0035] Put aramid, dimethyl sulfoxide, potassium hydroxide and water in a container, stir and disperse to obtain aramid nanofibers; mix aramid nanofibers with water to obtain aramid nanofiber suspension; aramid is made of poly P-phenylene terephthalamide; displacement of dimethyl sulfoxide in aramid nanofiber suspension by deionized water.

[0036] Step 2, preparation of polymer solution

[0037] Mix polyvinyl alcohol and deionized water and stir evenly to obtain a polyvinyl alcohol solution; wherein, the mass percentage of the polyvinyl alcohol solution is 10%.

[0038] Step 3, prepare mixed slurry

[0039] The aramid nanofiber suspension is mixed with the polyvinyl alcohol solution to obtain a mixed slurry; in the mixed slurry, the mass concentration of the aramid nanofiber suspen...

Embodiment 2

[0045] This embodiment 2 provides a kind of preparation method of aramid nanofiber-based composite airgel, comprising the following steps:

[0046] Step 1, preparation of aramid nanofiber suspension

[0047] Put aramid, dimethyl sulfoxide, potassium hydroxide and water in a container, stir and disperse to obtain aramid nanofibers; mix aramid nanofibers with water to obtain aramid nanofiber suspension; aramid is made of poly P-phenylene terephthalamide; displacement of dimethyl sulfoxide in aramid nanofiber suspension by deionized water.

[0048] Step 2, preparation of polymer solution

[0049] The chitosan is mixed with deionized water and stirred evenly to obtain a chitosan solution; wherein, the mass percentage of the chitosan solution is 5%.

[0050] Step 3, prepare mixed slurry

[0051] The aramid nanofiber suspension is mixed with the chitosan solution to obtain a mixed slurry; in the mixed slurry, the mass concentration of the aramid nanofiber suspension is 0.05%; the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
densityaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of aramid nanofiber-based composite aerogel, which comprises the following steps: preparing an aramid nanofiber suspension; mixing the aramid nanofiber suspension with a polymer solution to obtain mixed slurry, wherein the polymer solution is one of a polyvinyl alcohol solution, a starch solution, a chitosan solution and a sodium alginate solution; and carrying out freeze drying treatment on the mixed slurry to obtain the aramid nanofiber-based composite aerogel. According to the invention, an aramid nanofiber suspension and a polymer solution are mixed to form a strong intermolecular hydrogen-bond interaction in chemical bonding; the aramid nanofibers with high length-diameter ratio and polymer molecules are intertwined to form a cross-linked network structure, the micro-pore structure of the aramid nanofiber-based aerogel is regulated and controlled, the aramid nanofibers give full play to bridging connection of the micro-structure of the fibers, the aerogel material of a honeycomb ordered structure is prepared, and the aerogel material has the advantages of low heat conductivity coefficient, and better compression cyclicity and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, and in particular relates to an aramid fiber nanofiber-based composite airgel and a preparation method thereof. Background technique [0002] Airgel is a kind of ultra-light material with low density, high porosity, high specific surface area and excellent mechanical properties. They have a wide range of applications in antibacterial, heat preservation, oil-absorbing catalyst carriers and low dielectric constant substrates. In recent years, in order to improve the mechanical stability of aerogels, especially the toughness, various high-strength polymer aerogels have been developed, such as polyurethane aerogels, cellulose aerogels, polyamide aerogels, and nanoaromatic aerogels. Lun airgel, etc. Among them, lightweight fibers with ultra-high mechanical properties have become a research hotspot; para-aramid fibers, namely Kevlar fibers, are used for polymerization due to their high streng...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08L77/10C08L29/04C08L5/08C08L3/02C08L5/04
CPCC08J9/26C08J9/0061C08J2201/0484C08J2377/10C08J2429/04C08J2405/08C08J2403/02C08J2405/04
Inventor 陆赵情李娇阳花莉黄吉振贾峰峰陈珊珊
Owner SHAANXI UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com