Aerogel composite aramid non-woven fabric thermal protection material and preparation method thereof

A thermal protection material, non-woven technology, applied in textiles and papermaking, fiber type, fiber processing and other directions, can solve the problems of poor air permeability, affect work efficiency, affect comfort and other problems, achieve low density, excellent thermal insulation performance , good flame retardant and high temperature resistance performance

Active Publication Date: 2019-03-12
浙江鹏辰造纸研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that existing aramid fiber fabrics are heavy and poor in air permeability when used in firefighting clothing, which not only affects comfort, but also affects work efficiency, the purpose of the present invention is to provide an airgel composite aramid nonwoven fabric. Heat protection material and preparation method thereof, the material prepared by the invention has excellent properties such as good heat insulation, flame retardancy, high temperature resistance, light weight and good air permeability

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
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  • Aerogel composite aramid non-woven fabric thermal protection material and preparation method thereof
  • Aerogel composite aramid non-woven fabric thermal protection material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] The preparation of the thermal protection material of airgel composite aramid fiber nonwoven fabric comprises the following steps:

[0029] 1) Mix methyl orthosilicate, anhydrous methanol and water at a volume ratio of 1:5:2 at room temperature, stir well, and add hydrochloric acid aqueous solution with a mass concentration of 5% to the pH value of the mixed solution dropwise. After reaching 4.5, heat to 60°C, stir evenly and continue to keep warm for 2.5h, that is, the silica sol is made;

[0030] 2) Step 1) After adjusting the temperature of the obtained silica sol to 40°C, add an aqueous solution of sodium hydroxide with a mass concentration of 1% and mix until the pH value is 8.0, and spray the silica sol after adjusting the pH value on the aramid fiber nonwoven fabric On the cloth (aramid nonwoven fabric is aramid 1313, its thickness is 0.3mm, it is a meta-aramid nonwoven fabric made by spunlace process, and its thermal conductivity is 0.0313W / m.k), so that the sil...

Embodiment 2

[0036] The preparation of the thermal protection material of airgel composite aramid fiber nonwoven fabric comprises the following steps:

[0037] 1) Mix ethyl orthosilicate, absolute ethanol and water at a volume ratio of 1:3.5:1.2 at room temperature, stir well, and add hydrochloric acid aqueous solution with a mass concentration of 10% to the mixed solution dropwise until the pH value After reaching 4.0, heat to 55°C, stir evenly and continue to keep warm for 2.0h, the silica sol is made;

[0038] 2) After adjusting the temperature of the silica sol obtained in step 1 to 40°C, add an aqueous solution of sodium hydroxide with a mass concentration of 0.5% and mix until the pH value is 7.5, and spray the silica sol after adjusting the pH value on the aramid fiber nonwoven fabric On the cloth (the thickness of the aramid fiber nonwoven fabric is 1.0mm, it is a nonwoven fabric made of aramid fiber 1313 and aramid fiber 1414 by needle punching process, and the mass ratio of the a...

Embodiment 3

[0043] The preparation of the thermal protection material of airgel composite aramid fiber nonwoven fabric comprises the following steps:

[0044] 1) Mix ethyl orthosilicate, absolute ethanol and water at a volume ratio of 1:2:0.5 at room temperature, stir well, and add sulfuric acid aqueous solution with a mass concentration of 5% to the mixed solution dropwise until the pH value After reaching 3.5, heat to 50°C, stir evenly and continue to keep warm for 2.5h, the silica sol is made;

[0045] 2) Step 1) After adjusting the temperature of the obtained silica sol to 40°C, add ammonia solution with a mass concentration of 2% and mix until the pH value is 7.0, and spray the silica sol after adjusting the pH value on the aramid fiber nonwoven fabric (Aramid nonwoven fabric is aramid 1414, its thickness is 0.3mm, and it is made by spunlace process), so that the silica sol can penetrate into the inside of the aramid nonwoven fabric evenly, and keep it warm for 3 minutes (at this tim...

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Abstract

The invention discloses an aerogel composite aramid non-woven fabric thermal protection material and a preparation method thereof. The preparation method of the aerogel composite aramid non-woven fabric thermal protection material comprises the following steps of uniformly mixing a silicon source, organic solvent and water, dropwise adding in acid catalysts to regulate the pH, and then heating, mixing and temperature-keeping the mixture to obtain a silicon sol; regulating the temperature of the silicon sol, adding in alkali catalysts to regulate the pH, spraying the pH-regulated silicon sol onto an aramid non-woven fabric, standing the sprayed aramid non-woven fabric to obtain a wet gel-aramid non-woven fabric complex; lining macrocyclic polyester spiral drying screens into the wet gel-aramid non-woven fabric complex, rolling the lined wet gel-aramid non-woven fabric complex, immersing the fabric roll into ageing solution for ageing, performing supercritical drying on the aged fabric roll inside a supercritical drying device to obtain the aerogel composite aramid non-woven fabric thermal protection material. The prepared aerogel composite aramid non-woven fabric thermal protectionmaterial is excellent in properties such as thermal insulation, fire resistance, light weight and breathability.

Description

technical field [0001] The invention relates to a thermal protection material of an airgel composite aramid fiber nonwoven fabric and a preparation method thereof. Background technique [0002] Silica airgel is a new type of low-density, structure-controllable, lightweight nanoporous amorphous solid-state material with a spatial network structure composed of colloidal particles or polymer molecules cross-linked with each other. Due to its unique nanoscale Pore ​​structure characteristics make it have low density, high specific surface area, high porosity, low thermal conductivity, low dielectric constant and other characteristics, and have broad application prospects in high-efficiency heat insulation and adsorption. [0003] The three-dimensional nanoporous structure of airgel makes it have excellent characteristics on the one hand, but also leads to its poor strength and brittle quality on the other hand. In the current technology, various types of fiber-based composite ai...

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
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M17/00D06M11/79D06M101/36D06M101/32
CPCD06M11/79D06M13/144D06M13/513D06M17/00D06M2101/32D06M2101/36D06M2200/30
Inventor 王虹周小红
Owner 浙江鹏辰造纸研究所有限公司
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