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Flame-retardant thermal-insulation aerogel with fire early warning function as well as preparation method and application of flame-retardant thermal-insulation aerogel

A technology of fire early warning, flame retardant and heat preservation, applied in the field of flame retardant materials, can solve the problems of poor fire early warning effect, achieve the effect of prolonging the early warning time, improving thermal stability and fire safety

Pending Publication Date: 2022-04-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a flame-retardant thermal insulation aerogel with fire early warning function and its preparation method and application, and solve the technical problem of poor flame retardancy and fire early warning effect of traditional thermal insulation materials in the prior art

Method used

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  • Flame-retardant thermal-insulation aerogel with fire early warning function as well as preparation method and application of flame-retardant thermal-insulation aerogel
  • Flame-retardant thermal-insulation aerogel with fire early warning function as well as preparation method and application of flame-retardant thermal-insulation aerogel
  • Flame-retardant thermal-insulation aerogel with fire early warning function as well as preparation method and application of flame-retardant thermal-insulation aerogel

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Experimental program
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Effect test

preparation example Construction

[0025] The present invention also provides a method for preparing a flame-retardant heat-preserving aerogel with a fire warning function, comprising the following steps:

[0026] S1. After mixing the biomass-based material, the graphene oxide aqueous dispersion and the flame retardant material, they are fully dispersed to obtain a mixed hydrogel;

[0027] S2, pre-freezing the mixed hydrogel;

[0028] S3. Vacuum freeze-drying the pre-frozen mixed hydrogel to obtain a flame-retardant and heat-preserving aerogel with a fire warning function.

[0029] Further, the process of fully dispersing the biomass-based material, the graphene oxide aqueous dispersion and the flame retardant material after mixing is specifically: mixing the biomass-based material, the graphene oxide aqueous dispersion and the flame retardant material and stirring first 15 to 25 minutes, and then ultrasonically dispersed for 15 to 30 minutes.

[0030] Further, the pre-freezing process is carried out in a ref...

Embodiment 1

[0036] (1) Weigh 1g of sodium alginate and place it in a container, weigh and add 3.646g of graphene oxide aqueous dispersion and 0.056g of hydroxyapatite with a mass fraction of 1.524wt%, stir for 15min, and ultrasonically disperse for 25min to make it Fully dispersed to obtain a mixed hydrogel;

[0037] (2) Pour the mixed hydrogel into the mold and place it in a refrigerator at -15°C for 12 hours for pre-freezing;

[0038] (3) Put the pre-frozen mold filled with the mixed hydrogel into a vacuum freeze-drying oven at a temperature of -54°C for 48 hours to obtain a flame-retardant and heat-preserving airgel 1 with a fire warning function.

[0039] The density of airgel obtained in this example is 0.0102g cm -3 . Table 1 shows the total heat release, peak heat release rate, early warning response and duration test results of the airgel obtained in this example at a heating rate of 1°C / s and a temperature range of 50-600°C.

Embodiment 2

[0041] (1) Weigh 1g of sodium alginate and place it in a container, weigh and add 7.720g of graphene oxide aqueous dispersion and 0.058g of hydroxyapatite with a mass fraction of 1.524wt%, stir for 15min, and ultrasonically disperse for 30min to make it Fully dispersed to obtain a mixed hydrogel;

[0042] (2) Pour the mixed hydrogel into the mold and place it in a refrigerator at -15°C for 12 hours for pre-freezing;

[0043] (3) Put the pre-frozen mold filled with the mixed hydrogel into a vacuum freeze-drying oven at a temperature of -54°C for 48 hours to obtain a flame-retardant and heat-preserving airgel 2 with a fire warning function.

[0044] The airgel density obtained in this example is 0.0104g cm -3 . Table 1 shows the total heat release, peak heat release rate, early warning response and duration test results of the airgel obtained in this example at a heating rate of 1°C / s and a temperature range of 50-600°C.

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Abstract

The invention discloses flame-retardant thermal-insulation aerogel with a fire early warning function as well as a preparation method and application of the flame-retardant thermal-insulation aerogel. The flame-retardant thermal-insulation aerogel with the fire early warning function comprises the following raw materials: a solid component and water, wherein the solid component is prepared from the following components in percentage by mass: 5% of a flame retardant material, 5%-25% of graphene oxide and 70%-90% of a biomass-based material. The preparation method comprises the following steps: mixing a biomass-based material, a graphene oxide aqueous dispersion and a flame retardant material, and fully dispersing to obtain mixed hydrogel; the mixed hydrogel is subjected to pre-freezing and vacuum freeze drying, and the flame-retardant heat-preservation aerogel with the fire early warning function is obtained. Natural, renewable and degradable biomass-based thermal insulation aerogel is used as a main body, graphene oxide is introduced, the composite aerogel is endowed with a fire early warning function by utilizing the thermal reduction characteristic of the graphene oxide, the thermal stability and the fire safety of the aerogel are remarkably improved by introducing the flame retardant, and the early warning time of the aerogel is prolonged.

Description

technical field [0001] The invention relates to the technical field of flame-retardant materials, in particular to a flame-retardant and heat-preserving aerogel with a fire warning function and a preparation method and application thereof. Background technique [0002] The use of thermal insulation materials can effectively reduce energy consumption, and it is widely used in construction, energy chemical industry, aerospace and other fields. Currently commonly used organic insulation materials mainly include EPS (expandable polystyrene foam), PS (polystyrene foam), PU (polyurethane) and PF (phenolic foam), but they generally have poor heat resistance and are flammable. , Early combustion is not easy to be found, releases a large amount of heat during combustion, accelerates the spread of fire, and produces a large amount of toxic smoke and other safety hazards. Airgel is a three-dimensional nanoporous material with ultra-high porosity. Its low thermal conductivity, low refr...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L5/04C08K3/04C08K3/32G01N23/2202G01N23/2251
CPCC08J9/28G01N23/2251G01N23/2202C08J2305/04C08K3/042C08K3/32C08J2205/026
Inventor 袁必和罗子灏左博宇曹承然韩泽阳王勇杨方舟朱光玥宁颢煊牛奕周星宇
Owner WUHAN UNIV OF TECH
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