Normal pressure drying method for preparing melamine aerogel and fiber type clay reinforced melamine composite aerogel

A technology of composite aerogel and melamine gel, applied in the field of aerogel, can solve the problems of high cost, low strength, large-scale limitation of large-scale promotion and application, etc., and achieves the effect of short gel time and improved brittleness

Active Publication Date: 2021-07-23
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-porosity three-dimensional network structure of organic aerogels leads to low strength and high brittleness, and the drying method usually adopts an expensive supercritical drying process
The low strength and toughness of pure organic aerogels and the inability to dry them at atmospheric pressure to prepare large blocks are the biggest bottlenecks that limit the scale of popularization and application.

Method used

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  • Normal pressure drying method for preparing melamine aerogel and fiber type clay reinforced melamine composite aerogel
  • Normal pressure drying method for preparing melamine aerogel and fiber type clay reinforced melamine composite aerogel
  • Normal pressure drying method for preparing melamine aerogel and fiber type clay reinforced melamine composite aerogel

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Embodiment approach 1

[0025] This embodiment provides a method for preparing melamine airgel, specifically: take 0.3 g of melamine, add 5 mL of ethanol and stir to dissolve, then add 0.2 mL of hydrochloric acid and stir at a constant speed for 3 minutes at room temperature to obtain a melamine sol. The melamine sol was aged in a hydrothermal reactor at 100 °C for 20 hours to obtain a melamine gel. Soak the obtained melamine gel in ethanol at 50 °C, wash away the unreacted hydrochloric acid in the melamine gel, and finally dry the melamine gel in an oven at 50 °C under normal pressure to prepare melamine gas gel.

Embodiment approach 2

[0027] This embodiment provides a method for preparing melamine airgel, specifically: take 0.3 g of melamine and add 6.0 mL of isopropanol to stir and dissolve, then add 0.2 mL of hydrochloric acid and stir at a constant speed for 3 minutes at room temperature to obtain melamine sol . The melamine sol was aged in a hydrothermal reactor at 80 °C for 20 hours to obtain a melamine gel. The obtained melamine gel was soaked in isopropanol at 60 °C to wash off the unreacted hydrochloric acid in the melamine gel, and finally the melamine gel was dried in an oven at 60 °C under normal pressure to obtain a dense Amine airgel.

Embodiment approach 3

[0029] This embodiment provides a method for preparing melamine airgel, specifically: take 0.2 g of melamine and add 6.0 mL of isopropanol to stir and dissolve, then add 0.2 mL of hydrochloric acid and stir at a constant speed for 3 minutes at room temperature to obtain melamine sol . The melamine sol was aged in a hydrothermal reactor at 160 °C for 8 h to obtain a melamine gel. Soak the obtained melamine gel in ethanol at 50 °C to wash off the unreacted hydrochloric acid in the melamine gel, and finally dry the melamine gel in an oven at 45 °C under normal pressure to obtain melamine gas gel.

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Abstract

The invention belongs to the technical field of material manufacturing, and discloses a method for preparing melamine composite aerogel and fiber type clay reinforced melamine composite aerogel by a normal pressure drying method. Melamine resin is used as a main material, melamine gel and fiber type clay composite reinforced melamine gel are prepared through solvent heat treatment under the acidic condition, a catalyst is washed away through an alcohol reagent, and the melamine composite aerogel which is complete in block and good in mechanical property can be obtained through normal-pressure drying. The fiber type clay is adopted to reinforce the melamine composite aerogel, and the clay can construct a double-network structure in a melamine gel network, so that the aerogel with better mechanical properties is obtained. The material can be carbonized to obtain self-supporting carbon aerogel which can be used in the fields of catalyst loading, adsorption, energy storage, heat insulation and flame retardant materials and the like. The gel time is short, a normal-pressure drying method is adopted as a drying process, a large amount of organic solvent is not used for solvent replacement, the preparation process is simple, the preparation period is short, and the large-scale production requirement can be met.

Description

technical field [0001] The invention relates to the technical field of airgel, in particular to an atmospheric pressure drying method for preparing melamine airgel and fiber-type clay-reinforced melamine composite airgel. Background technique [0002] Airgel material, also known as "solidified smoke", is a lightweight nanoporous solid material composed of nano-level particles aggregated to form a three-dimensional pore network structure, and the network skeleton is filled with a gaseous dispersion medium. Organic airgel is a kind of porous material composed of polymer molecules, which has a unique nanoporous and continuous three-dimensional network structure. At present, organic aerogels have broad application prospects in the fields of catalysts and supports, and high-efficiency heat insulation. However, the high-porosity three-dimensional network structure of organic aerogels leads to low strength and high brittleness, and the drying method usually adopts an expensive sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L61/28C08K7/10B01J13/00
CPCC08J9/28B01J13/0091C08J2201/0502C08J2361/28C08K7/10
Inventor 金慧然陈静顾亚伟戴陈晔云山丁师杰
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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