Flexible high flame retardant biologic aerogel material and preparation method thereof

A bio-based, aerogel technology, applied in coatings and other directions, can solve problems such as poor fire safety, and achieve the effects of improving flame retardant performance, improving mechanical properties, and excellent resilience performance.

Active Publication Date: 2019-03-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with organic-inorganic elastic aerogels, the mechanical properties of crosslinked macromolecular elastic aerogels are superior; however, such aerogels are constructed of pure organic compounds, which are less fire safe
Therefore, how to endow the cross-linked macromolecular aerogel with high flame retardancy while maintaining its excellent resilience performance, so that it can become an ideal substitute for traditional foam materials, has been seldom reported so far.

Method used

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  • Flexible high flame retardant biologic aerogel material and preparation method thereof
  • Flexible high flame retardant biologic aerogel material and preparation method thereof
  • Flexible high flame retardant biologic aerogel material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A method for preparing a flexible and highly flame-retardant bio-based airgel material, comprising the following steps:

[0042] Step 1, prepare 1% chitosan acetic acid solution of mass percentage concentration, then pour the chitosan acetic acid solution into the middle pass mold with a metal plate at the bottom and place it at -50°C in one direction to be refrigerated and frozen into a solid. Then vacuum freeze-dry in a freeze dryer to make chitosan airgel;

[0043] Step 2, placing the chitosan aerogel in a vacuum oven at 150° C. for heat treatment for 12 hours to obtain a flexible and highly flame-retardant chitosan aerogel.

Embodiment 2

[0045] A method for preparing a flexible and highly flame-retardant bio-based airgel material, comprising the following steps:

[0046] Step 1, prepare 3% chitosan acetic acid solution of mass percentage concentration, then pour the chitosan acetic acid solution into the middle pass mold with a metal plate at the bottom and place it at -80°C in one direction to be refrigerated and frozen into a solid. Then vacuum freeze-dry in a freeze dryer to make chitosan airgel;

[0047] Step 2, placing chitosan airgel in a vacuum oven at 180°C for heat treatment for 15 hours to obtain flexible and highly flame-retardant chitosan airgel;

Embodiment 3

[0049] A method for preparing a flexible and highly flame-retardant bio-based airgel material, comprising the following steps:

[0050] Step 1, preparing 5% chitosan acetic acid solution in mass percent concentration, then pouring the chitosan acetic acid solution into a central pass mold with a metal plate at the bottom and placing it at -150°C in one direction to be refrigerated and frozen into a solid. Then vacuum freeze-dry in a freeze dryer to make chitosan airgel;

[0051] Step 2, placing chitosan airgel in a dry vacuum environment at 200°C for heat treatment for 6 hours to obtain flexible and highly flame-retardant chitosan airgel; the dry vacuum environment is to place a sufficient amount of Phosphorus pentoxide to ensure the smooth progress of the curing process;

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Abstract

The invention discloses a preparation method of a flexible high flame retardant biologic aerogel material. The preparation method comprises the following steps: preparing a biomass macromolecular solution; uniformly mixing the biomass macromolecular solution with a synthesized resin precursor solution to obtain a mixed solution, then quickly placing the mixed solution at -20 to -200 DEG C to be cooled in a single direction and freezing the mixed solution to a solid; and finally, freezing and drying the solid in a freeze dryer to obtain a biologic aerogel and crosslinking the biologic aerogel in a dried vacuum environment or a dried alkaline vacuum environment at 150-200 DEG C for 0.5-50 h to obtain the flexible high flame retardant biologic aerogel material. The material has anisotropic mechanical property, has high axial strength and has rebound resilience radially. The pore wall of the material has a porous structure, and the aerogel prepared by the porous material has an ultralow heat conductivity coefficient which is 0.002-0.02W/(m.K). The density of the material is 16-181 kg/m<3>, the extreme oxygen index is 24.0-39.0%, the peak heat release rate is 55.6-245.6 kW/m<2>, and thecontact angle of the aerogel is 60-148 degrees.

Description

technical field [0001] The invention belongs to the technical field of airgel materials and their preparation, and in particular relates to a flexible and highly flame-retardant bio-based airgel material and a preparation method thereof. Background technique [0002] Soft resilient foam material, because of its low density, good elastic recovery, sound absorption and thermal insulation, is widely used in aerospace, transportation, military, industrial and civil fields, and is an indispensable material. At present, soft resilient foam materials mainly include soft polyurethane foam and melamine formaldehyde foam, etc. Among them, melamine formaldehyde foam limits its application due to its high formaldehyde emission, while the raw material of polyurethane foam mainly comes from petroleum, which is extremely flammable , has a major fire safety hazard, and does not meet the requirements of sustainable development in terms of environment and resources. [0003] Airgel is one of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08J9/28C08L5/08C08L5/06C08L5/04C08L61/28C08L61/06C08L61/24
CPCC08J9/28C08J9/36C08J2201/0522C08J2305/04C08J2305/06C08J2305/08C08J2361/06C08J2361/24C08J2361/28C08J2405/04C08J2405/06C08J2405/08C08J2461/06C08J2461/24C08J2461/28
Inventor 王玉忠汪婷赵海波龙曼成李蒙恩李书亮徐世美
Owner SICHUAN UNIV
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