Preparation method of heat-insulating and flame-retardant composite aerogel foam

A flame retardant composite and composite gel technology, which is applied in airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem of poor compatibility between inorganic flame retardants and polymer foam resins, and the flame retardant effect cannot meet the requirements , organic flame retardants are not environmentally friendly, etc., to achieve the effect of short gel time, low shrinkage rate, good heat insulation and flame retardant performance

Active Publication Date: 2021-08-24
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the foam is filled with organic flame retardants to minimize flammability, organic flame retardants are not environmentally friendly, and the flame retardant effect cannot meet the requirements
Inorganic foams are directly compounded with inorganic flame retardants such as carbon nanotubes, graphene, flake ash, silica fume, and clay. Although the resulting composite foam can effectively improve the flame retardancy of the foam, the difference between the inorganic flame retardants and the polymer foam resin Poor compatibility, uneven foam

Method used

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  • Preparation method of heat-insulating and flame-retardant composite aerogel foam
  • Preparation method of heat-insulating and flame-retardant composite aerogel foam
  • Preparation method of heat-insulating and flame-retardant composite aerogel foam

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Experimental program
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Effect test

Embodiment approach 1

[0024] Attapulgite was uniformly dispersed in water to prepare 50 mL of attapulgite slurry with a concentration of 3 wt%. Chitosan was uniformly dispersed in an acetic acid solution with a pH of 4 to prepare 50 ml of chitosan sol with a concentration of 2 wt%. The attapulgite slurry and chitosan sol were uniformly mixed at a volume ratio of 1:0.5, stirred at a constant speed at 1000 rpm for 30 min, and then 3 mL of glutaraldehyde solution with a mass concentration of 2.5% was added as a crosslinking agent, and the stirring was continued. Obtain attapulgite-chitosan composite slurry uniformly. The melamine foam was evenly immersed in the attapulgite-chitosan composite slurry, and the foam was evenly squeezed for 5 min to make the attapulgite-chitosan composite slurry filled with the melamine foam. Soak the melamine foam with attapulgite-chitosan composite slurry in an alkaline solution with pH=10 to form a gel, and age the gel for 24 hours to obtain a composite gel foam. The ...

Embodiment approach 2

[0026] The sepiolite was uniformly dispersed in water to prepare 50 mL of sepiolite slurry with a concentration of 5 wt%. Sodium alginate was uniformly dispersed in aqueous solution to prepare 50 ml of sodium alginate sol with a concentration of 0.5 wt%. The above-mentioned sepiolite slurry and sodium alginate sol were uniformly mixed at a volume ratio of 1:0.2, stirred at a constant speed at 1000 rpm for 30 min, and then 1 mL of glutaraldehyde solution with a mass concentration of 2.5% was added as a crosslinking agent. Continue to stir evenly to obtain sepiolite-sodium alginate composite slurry. The melamine foam was evenly immersed in the sepiolite-sodium alginate composite slurry, and the foam was evenly squeezed for 10 min to fill the sepiolite-sodium alginate composite slurry with the melamine foam. Soak the melamine foam with sepiolite-sodium alginate composite slurry in the aqueous solution, add 1 mL of 1 wt% calcium chloride solution to form a gel, and age the gel fo...

Embodiment approach 3

[0028] Halloysite was uniformly dispersed in water to prepare 50 mL of halloysite slurry with a concentration of 4 wt%. Pectin was uniformly dispersed in aqueous solution to prepare 50 ml pectin sol with a concentration of 5 wt%. The above-mentioned halloysite slurry and pectin sol were uniformly mixed at a volume ratio of 1:1, and after stirring at a constant speed of 1000 rpm for 30 min, 1.5 mL of glutaraldehyde solution with a mass concentration of 2.5% was added as a crosslinking agent, continued Stir evenly to obtain halloysite pectin compound slurry. The melamine foam was evenly immersed in the halloysite-pectin composite slurry, and the foam was evenly squeezed for 8 min to fill the halloysite-pectin composite slurry with the melamine foam. Soak the melamine foam with halloysite-pectin composite slurry in the alkaline aqueous solution of pH=9, add 3 mL of 2.5 wt% calcium chloride solution to form a gel, and age the gel for 24 hours Composite gel foam. The above-menti...

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Abstract

The invention relates to the technical field of composite foam and aerogel, and discloses a preparation method of heat-insulating and flame-retardant composite aerogel foam, wherein the preparation method comprises the steps: uniformly stirring and mixing fiber type clay slurry and natural polymer sol, adding a cross-linking agent, and continuously stirring uniformly to obtain clay-natural polymer composite slurry; taking melamine foam, immersing into the composite slurry, and uniformly extruding the foam to enable the composite slurry to be filled with the melamine foam; infiltrating the melamine foam with the composite slurry in water or an alkaline solution to form gel, and aging the gel to obtain composite gel foam; and freezing the composite gel foam at an ultralow temperature, carrying out solvent replacement by using an alcoholic solution at a low temperature, and finally drying at normal pressure to obtain the clay-natural polymer-melamine composite aerogel foam. The prepared composite aerogel foam is low in density, low in shrinkage rate and good in mechanical property, has a micropore-mesopore-macropore hierarchical pore structure, and also has great potential application in the fields of adsorption separation, energy storage and the like.

Description

technical field [0001] The invention relates to the technical fields of composite foam and airgel, in particular to a method for preparing heat-insulating and flame-retardant composite airgel foam, in particular to a method for preparing organic-inorganic composite airgel foam. Background technique [0002] Melamine foam has a low thermal conductivity (<0.04 w m -1 k -1 ), low density (0.015-0.040 g / cm 3 ), good compressive strength, and has been widely used in construction, transportation and other fields. However, the flame retardancy of melamine foam can only reach the B-level standard, which cannot meet the increasing requirements for the safety of thermal insulation materials in the construction field. Therefore, it is still an unresolved research topic to effectively improve the flame retardancy of melamine foam. [0003] The traditional method of preparing flame-retardant organic foam plastics is to directly fill organic flame retardants or inorganic flame reta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L61/28C08L5/04C08L5/08C08L1/02C08L5/06C08K7/10B01J13/00
CPCC08J9/28B01J13/0091C08J2201/0502C08J2361/28C08J2405/04C08J2405/08C08J2401/02Y02B80/10
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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