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A kind of preparation method and product of graphene composite fumed silica foam fire extinguishing agent

A composite technology of fumed silica and graphene, which is applied in the direction of fire prevention equipment, etc., can solve the problems of unstable dispersion of fumed silica, achieve the effects of increasing stability, weakening defoaming effect, and increasing dispersibility

Active Publication Date: 2022-04-05
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of unstable dispersion of fumed silica in aqueous solution, the object of the present invention is to provide a preparation method of graphene composite fumed silica foam fire extinguishing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A 1:5 type graphene composite fumed silica foam fire extinguishing agent, composite reduced graphene oxide on the surface of fumed silica, control the reduction amount by heating time, and further compound hydrolyzed protein, and form a stable dispersed fire extinguishing compound in the aqueous solution Thing, thereby prepare foam fire extinguishing agent, prepare as follows:

[0020] (1) Preparation of graphene and fumed silica mixture:

[0021] Add 100 mg of graphene oxide powder into 100 mL of water, stir and ultrasonically dissolve to obtain a graphene oxide solution;

[0022] Mix 500 mg of fumed silica and graphene oxide solution with an average particle size of 7 nm through rapid stirring and ultrasound to obtain a mixed solution; wherein the mixture is stirred rapidly at room temperature for 0.5 h, ultrasonically for 0.5 h, and then stirred rapidly for 0.5 h;

[0023] (2) Partial reduction of graphene oxide to form a composite of reduced graphene and fumed sili...

Embodiment 2

[0031] A 1:5 type graphene composite fumed silica foam fire extinguishing agent, composite reduced graphene oxide on the surface of fumed silica, control the amount of reduction by adding the reducing agent, and further compound hydrolyzed protein, the formed aqueous solution is stable Disperse fire extinguishing compound, thereby prepare foam fire extinguishing agent, prepare according to the following steps:

[0032] (1) Preparation of graphene and fumed silica mixture:

[0033] Dissolve 100 mg of graphene oxide powder in 100 mL of water at room temperature, and stir and ultrasonically dissolve to obtain a graphene oxide solution; 500 mg of fumed silica with an average particle size of 7 nm and graphene oxide solution was stirred rapidly for 0.5 h, and ultrasonically 0.5 h, and then stirred rapidly for 0.5 h to fully mix to obtain a mixed solution;

[0034] (2) Partially reduce graphene oxide to form a composite of reduced graphene and fumed silica: keep stirring and heat t...

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Abstract

The invention discloses a method for preparing a graphene-composite gas-phase silica foam fire extinguishing agent and its products. The graphene oxide is compounded on the surface of gas-phase silica and further compounded with hydrolyzed protein to form a stable and dispersed fire-extinguishing compound in an aqueous solution, thereby preparing Foam extinguishing agent. Using fumed silica as the core, sequentially compounding reduced graphene oxide and hydrolyzed protein forms a complex sol, which can be stably dispersed in a fire extinguishing agent solution. By compounding graphene outside fumed silica, its dispersibility in aqueous solution is greatly increased. Hydrolyzed protein is used to further compound the graphene and fumed silica composite, while increasing its stability and weakening its defoaming effect, forming a practical fire extinguishing compound.

Description

technical field [0001] The present invention relates to the field of fire extinguishing agent, more specifically, to foam fire extinguishing agent, especially to a preparation method of graphene composite fumed silica foam fire extinguishing agent and its product. Background technique [0002] In order to extinguish stubborn fires, it is often necessary to add other fire-resistant nanoparticles to the foam fire extinguishing agent, such as nano-silica, graphite micropowder, silicon micropowder and nanoscale copper powder (Tang Baohua, Chen Weihong, Yang Shuanghua, etc. Powder Research on the influence of foam fire extinguishing agent on foaming ability and thermal stability [J]. Liaoning Chemical Industry, 2014, 043(009):1101-1103.). Among them, nano silicon dioxide is generally prepared by a gas phase method, also known as fumed silicon dioxide. Fumed silica has the characteristics of easy preparation, low toxicity, excellent heat insulation performance and anti-burning pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D1/02A62D1/04
CPCA62D1/0078
Inventor 崔大祥张放为张芳卢玉英焦靖华王亚坤阳靖峰葛美英
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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