NL2029260A - Water-based aerogel efficient fire extinguishing agent and preparation method thereof - Google Patents

Water-based aerogel efficient fire extinguishing agent and preparation method thereof Download PDF

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Publication number
NL2029260A
NL2029260A NL2029260A NL2029260A NL2029260A NL 2029260 A NL2029260 A NL 2029260A NL 2029260 A NL2029260 A NL 2029260A NL 2029260 A NL2029260 A NL 2029260A NL 2029260 A NL2029260 A NL 2029260A
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fire extinguishing
water
extinguishing agent
flame retardant
airgel
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NL2029260A
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Dutch (nl)
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NL2029260B1 (en
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An Chun
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Anhua Fire New Material Tech Jiangsu Co Ltd
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0064—Gels; Film-forming compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/0091—Preparation of aerogels, e.g. xerogels

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dispersion Chemistry (AREA)
  • Fireproofing Substances (AREA)
  • Fire-Extinguishing Compositions (AREA)

Abstract

With inorganic aerogel powder, template agent, phosphorous flame retardant, nitrogenous flame retardant and hydrophilic colloid stabilizer as raw materials, the water-based aerogel efficient fire extinguishing agent of the present invention can significantly enhance the efficiency of fire extinguishing agent by using the ultra-low thermal conductivity and ultra-high adsorption capacity of inorganic nano-porous aerogels; meanwhile, a combination of phosphorous flame retardant and nitrogenous flame retardant serve as a relevant functional component of the fire extinguishing agent, and the colloid stabilizer and the icon buffer are added into the water-based aerogel so as to enhance the uniformity and shelf life of the flame retardants, so that the fire extinguishing agent not only has efficient fire extinguishing function, excellent fire resistance function and flame retardant function, but also has a comparatively long quality guaranty and storage life, thereby having an effectively expanded fire extinguishing types, efficiency and application range.

Description

i
WATER-BASED AEROGEL EFFICIENT FIRE
EXTINGUISHING AGENT AND PREPARATION METHOD
THEREOF
Technical Field
The present invention relates to the field of emergency and security new materials, particularly relates to a water-based aerogel efficient fire extinguishing agent, and further discloses a preparation method thereof.
Background Art
There are always reports that people’s lives and property safety are being severely threatened by shocking fires, so the performances and functions of fire extinguishing agents have been attracting more and more attentions. Fire extinguishing agents refer to substances that can effectively destroy combustion conditions and thus stop combustion. The fire extinguishing agents used in traditional fire extinguishing products in market mainly include water-based fire extinguishing agents, dry powder fire extinguishing agents and clean gas fire extinguishing agents.
Regardless of their formulations, traditional fire extinguishing agents usually play a role in extinguishing fire from two aspects: one is temperature reduction, for instance, water can be used to bring the temperature of a combustion material down below the ignition point, and the liquid precipitated from the foam can cool the surface of a comburent; the other is oxygen insulation, for instance, foam or powder can be used to cover the surface of a comburent so to isolate 1t from air (oxygen), and the so-called “suffocation” caused by carbon dioxide also belongs to this principle.
However, there are usually many defects during the process of using traditional fire extinguishing agents: 1. incompatible functions: it is often that traditional fire extinguishing agents cannot have both “cooling” and “isolation” functions at the same time, so different fire extinguishing agents are needed for different fire sources, which makes the operation more complicated; 2. limited application scenarios: the application scenarios of traditional fire extinguishing agents are greatly limited, for instance, foam extinguishing agents are not suitable for extinguishing live equipment fires, metal fires and gas fires, carbon dioxide extinguishing agents are not suitable for extinguishing chemical fires, metal fires and fiber material fires, and direct application of water on oil fires and combustible dust may easily cause deflagration; 3. unsatisfactory effects: insufficient effectiveness of traditional fire extinguishing agents are often shown at critical moments of fires, firefighters were powerless when facing the raging flames in both the accident of “Shenghua Company Deflagration in Zhangjiakou on 11.28” and the accident of “Tianjiayi Company Explosion in Xiangshui on 3.21”, and they had to wait to carry out fire fighting and rescue only after the burning momentum was less fierce; 4. inadequate environmental protection: traditional fire extinguishing agents can easily cause injuries during using and have environmental pressures because they may cause pollutions when they are due to be recycled, so traditional fire extinguishing agents must meet the requirements of green environmental protection when the concept of green waters and mountains has been deeply rooted in people’s hearts.
As a result, although traditional fire extinguishing agents are still occupying the market and playing an important role, they need to be upgraded. A new generation of multi-functional and efficient fire extinguishing agents is urgently needed, because traditional water-based fire extinguishing agents cannot take into account both general fires and oil fires, edible oil fires and live equipment fires; moreover, traditional fire extinguishing agents have such use defects as low fire fighting efficiency.
Summary of the Invention
Therefore, the technical problem to be solved by the present invention is to provide a water-based aerogel efficient fire extinguishing agent, so as to overcome the following defects of prior art, such as narrow range of fire extinguishing objects, weak flame retardancy and low fire extinguishing efficiency.
The second technical problem to be solved by the present invention is to provide a preparation method of the above-mentioned water-based aerogel efficient fire extinguishing agent.
In order to solve the above-mentioned technical problem, the water-based aerogel efficient fire extinguishing agent according to the present invention, based on the total amount of preparation raw materials for the fire extinguishing agent, comprises raw material components with the following mass contents:
Inorganic aerogel powder 2-10 wt%;
Template agent 4-9 wt%;
Phosphorous flame retardant 15-18 wt%;
Nitrogenous flame retardant 13-16 wt%;
Hydrophilic colloid stabilizer 3-5 wt%,;
Hydrogen ion concentration buffer 3-6 wt%;
Water the rest.
Specifically, the inorganic aerogel powder comprises at least one of the aerogel powders such as silicon oxide, alumina, zirconia, silica-aluminum binary hybrid and silica-zirconia binary hybrid; preferably, the inorganic aerogel needs to be preprocessed into a powder with a particle size of 10-100 microns.
Specifically, the template agent comprises at least one of cetyltrimethylammonium bromide, sodium dodecylbenzene sulfonate or cetyltrimethylammonium chloride.
Specifically, the phosphorus flame retardant comprises at least one of ammonium dihydrogen phosphate, tri-(2,3-dibromopropyl) phosphate ester or trusocyanate thiophosphate.
Specifically, the nitrogenous flame retardant comprises a mixture of at least two of urea, ammonium pentaborate (NH4BsOs-4H,0O), ammonium bicarbonate (NH4HCO3) or melamine cyanurate.
Specifically, the hydrophilic colloid stabilizer comprises at least one of carbomer, alginate or carboxymethyl cellulose.
Specifically, the hydrogen ion concentration buffer comprises a mixture of at least two of sodium dihydrogen phosphate, dipotassium hydrogen phosphate, acetic acid, sodium acetate, ammonia water and ammonium chloride.
The present invention further discloses a preparation method of the water-based aerogel efficient fire extinguishing agent, including the following steps of: (1) preparing aerogel sol: take a selected amount of aerogel powder and inlet nitrogen at 180-250°C for heat treatment of surface modification, add a selected amount of the template agent for mixing and full grinding, and then add water and stir well, thereby obtaining needed aerogel sol, which is ready for use; (2) preparing water-based flame retardant agent: take a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant and mix them, add water for full mixture, and then add a selected amount of the hydrophilic colloid stabilizer and stir well, thereby obtaining a needed mixed liquor of water-based flame retardant agent, which is ready for use; (3) adjusting pH value: stir the obtained aerogel sol and mixed liquor of water-based flame retardant agent well, and add the hydrogen 10n concentration buffer so as to adjust the pH value of the mixed liquor to be neutral (6.5-7.5); and (4) curing: cure the obtained mixed material liquor at room temperature, thereby obtaining the needed fire extinguishing agent. 5 Specifically, in the step (1): processing time for the heat treatment of surface modification for the aerogel powder 1s at least 3h; and processing time for the grinding is at least 3h.
Specifically, in step (4), processing time for the curing step 1s 8-9h.
With organic aerogel powder, template agent, phosphorous flame retardant, nitrogenous flame retardant and hydrophilic colloid stabilizer as raw materials, the water-based aerogel efficient fire extinguishing agent of the present invention can significantly enhance the efficiency of fire extinguishing agent by using the ultra-low thermal conductivity and ultra-high adsorption capacity of inorganic nano-porous aerogels; meanwhile, a combination of phosphorous flame retardant and nitrogenous flame retardant serve as a relevant functional component of the fire extinguishing agent, and the colloid stabilizer and the icon buffer are added mto the water-based aerogel so as to enhance the uniformity and shelf life of the flame retardants, so that the fire extinguishing agent not only has efficient fire extinguishing function, excellent fire resistance function and flame retardant function, but also has a comparatively long quality guaranty and storage life, thereby having an effectively expanded fire extinguishing types, efficiency and application range.
As for the water-based aerogel efficient fire extinguishing agent of the present invention, inorganic nano-porous aerogel is first applied to the fire extinguishing agent, wherein the inorganic nano-porous aerogel includes at least one of the aerogels such as silica, alumina, zirconia, silicon aluminum binary hybrid, silicon zirconium binary hybrid aerogel, and the aerogel is used after being preprocessed mto particles with a powder with a particle size of 10-100 microns.
After full absorption of fire extinguishing agent, a surface of the aerogel particle is uneven due to the abundant of holes, so the surface area is much greater than that of liquid particle (droplet) of the same volume, as a result, the volatilization of the fire extinguishing agent is also much faster than that of droplets under the same conditions, heat can be taken away much faster by the volatilization of the fire extinguishing agent than by that of pure liquid fire extinguishing agents, temperature is lowered more rapidly, and thus the fire center can be reached directly.
Moreover, aerogel particles with full absorption of fire extinguishing agent are formed with a layer of aerogel thermal insulation layer after volatilization of the fire extinguishing agent on the surface, which avoids over fast volatilization of the fire extinguishing agent in the center part and makes it possible to directly reach the fire center through the flame.
Aerogel particles are adhered onto the surface of the comburent, while the fire extinguishing agent in the center continues to directly lower the temperature of the fire center, thereby overcoming defects of traditional pure liquid fire extinguishing agent, namely, in case of a fierce fire, traditional pure liquid fire extinguishing agents will be fully volatilized before reaching the fire center, so traditional pure liquid fire extinguishing agents can hardly be sprayed into the fire center.
In addition, with a small volume, a light weight and a large surface area, the aerogel particles have an extremely high adsorption (adhesion), and can be rapidly adhered onto the surface of a comburent to cut off the air (oxygen), and can rapidly float and cover the surface of burning oil so as to cut off the air (oxygen), thereby rapidly extinguishing fire.
The huge specific surface area of aerogel can also efficiently adsorb a variety of toxic and harmful gases.
This agent is capable of rapidly adsorbing all kinds of smoke right after being sprayed for fire extinguishing, so that thick black fire smoke disappears rapidly and lives are effectively protected.
In addition, aerogel is currently a material with the lowest thermal conductivity in the world and has an efficient heat msulation effect; meanwhile, inorganic aerogel is also an excellent fireproof and flame retardant material. When it 1s adhered to cover the surface of a comburent, it can effectively extinguish fires, as well as can retard flames and prevent re-burning.
For forest, grassland and other mass fires, the present fire extinguishing agent can be sprayed to rapidly and efficiently form a fire barrier zone. To sum up, the water-based aerogel efficient fire extinguishing agent of the present invention effectively solves the problems of narrow application range of fire extinguishing objects, insufficient flame retardant performance and low fire extinguishing efficiency in the prior art, and has an extremely high application value.
Description of Drawings
For easy and clear understanding, details of the present invention will be further described according to the embodiments of the present invention and with reference to the drawing.
Fig. 1 is a flowchart for preparing the water-based aerogel efficient fire extinguishing agent of the present invention.
Embodiments
Embodiment 1
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica inorganic aerogel powder (a particle size being 20-30 micron) 2.5 wt%;
Template agent (cetyltrimethylammonium bromide) 6 wt%;
Phosphorous flame retardant (ammonium dihydrogen phosphate) 16 wt%;
Nitrogenous flame retardant (urea: ammonium pentaborate=1:1) 15 wt%;
Hydrophilic colloid stabilizer (Carbomer) 3.5 wt%;
Hydrogen ion concentration buffer (sodium dihydrogen phosphate, acetic acid) 4 wt%;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment includes the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 220°C for heat treatment of 4h; then, add a selected amount of the template agent for mixing and full grinding for 4h; add a proper amount of deionized water and stir for 2.5h after grinding and mixing, wherein the amount of deionized water is no less than 25 wt% of the total amount and the rotation speed of the mixer is controlled to be 120-150 r/min, thereby obtaining needed aerogel sol, which is ready for use; (2) preparing water-based flame retardant agent: take another amount, which 1s no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which 1s ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 100-120 r/min and stir for at least 2h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 2
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica inorganic aerogel powder (a particle size being 50-100 micron) 4 wt%;
Template agent (cetyltrimethylammonium bromide) 5 wt%;
Phosphorous flame retardant (ammonium dihydrogen phosphate: trisocyanate thiophosphate=1:1) 15 wt%;
Nitrogenous flame retardant (urea: ammonium bicarbonate =1:1) 15 wt%;
Hydrophilic colloid stabilizer (alginate) 4 wt%;
Hydrogen 10n concentration buffer (dipotassium hydrogen phosphate, acetic acid) 5 wt“;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment includes the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 250°C for heat treatment of 3h; then, add a selected amount of the template agent for mixing and full grinding for 4h; add a proper amount of deionized water and stir for 2.5h after grinding and mixing, wherein the amount of deionized water is no less than 30 wt% of the total amount and the rotation speed of the mixer is controlled to be 150-180 r/min, thereby obtaining needed aerogel sol, which 1s ready for use;
(2) preparing water-based flame retardant agent: take another amount, which 1s no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which is ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 120-150 r/min and stir for at least 2h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 3
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Alumina inorganic aerogel powder (a particle size being 30-50 micron) 6 wt%;
Template agent (cetyltrimethylammonium bromide) 7 wt%;
Phosphorous flame retardant (ammonium dihydrogen phosphate: tri-(2,3-dibromopropyl) phosphate ester =1:1) 16 wt%;
Nitrogenous flame retardant (ammonium bicarbonate: melamine cyanurate =1:1) 15 wt%;
tl
Hydrophilic colloid stabilizer (carboxymethyl cellulose) 4.5 wt%;
Hydrogen ion concentration buffer (ammonia water, acetic acid) 3.5 wt;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment includes the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 200°C for heat treatment of Sh; then, add a selected amount of the template agent for mixing and full grinding for 3h; add a proper amount of deionized water and stir for 2.5h after grinding and mixing, wherein the amount of deionized water is no less than 25 wt% of the total amount and the rotation speed of the mixer is controlled to be 120-150 r/min, thereby obtaining needed aerogel sol, which is ready for use; (2) preparing water-based flame retardant agent: take another amount, which is no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which is ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 120-150 r/min and stir for at least 2h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 4
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Zirconia inorganic aerogel powder (a particle size being 15-20 micron) 9 wt;
Template agent (sodium dodecylbenzene sulfonate) 6 wt%;
Phosphorous flame retardant (triisocyanate thiophosphate) 15 wt%;
Nitrogenous flame retardant (ammonium bicarbonate: melamine cyanurate =1:1) 13 wt%:
Hydrophilic colloid stabilizer (alginate) 4.5 wt;
Hydrogen ion concentration buffer (sodium acetate, acetic acid) 5 wt%;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment includes the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 220°C for heat treatment of 3h; then, add a selected amount of the template agent for mixing and full grinding for 3h; add a proper amount of deionized water and stir for 2h after grinding and mixing, wherein the amount of deionized water is no less than 30 wt% of the total amount and the rotation speed of the mixer is controlled to be 150-180 r/min, thereby obtaining needed aerogel sol, which 1s ready for use; (2) preparing water-based flame retardant agent: take another amount, which
1s no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which is ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 150-180 r/min and stir for at least 4h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 5
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica-aluminum binary hybrid inorganic aerogel powder (a particle size being 20-30 micron) 5 wt%;
Template agent (sodium dodecylbenzene sulfonate) 8 wt,
Phosphorous flame retardant (ammonium dihydrogen phosphate: triisocyanate thiophosphate=1:1) 15 wt%;
Nitrogenous flame retardant (ammonium pentaborate: melamine cyanurate =1:1) 15 wt%:;
Hydrophilic colloid stabilizer (carbomer: alginate=1:1) 5 wt%;
Hydrogen ion concentration buffer (sodium acetate, acetic acid) 5 wt%;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment includes the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 250°C for heat treatment of 3h; then, add a selected amount of the template agent for mixing and full grinding for 3h; add a proper amount of deionized water and stir for 2h after grinding and mixing, wherein the amount of deionized water is no less than 25 wt% of the total amount and the rotation speed of the mixer is controlled to be 150-180 r/min, thereby obtaining needed aerogel sol, which 1s ready for use; (2) preparing water-based flame retardant agent: take another amount, which is no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which is ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 150-180 r/min and stir for at least 4h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 6
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica-zirconia binary hybrid inorganic aerogel powder (a particle size being 15-20 micron) 8 wt%;
Template agent (cetyltrimethylammonium bromide: sodium dodecylbenzene sulfonate=1:1) 5 wt%:
Phosphorous flame retardant (ammonium dihydrogen phosphate: triisocyanate thiophosphate=1:1) 18 wt%;
Nitrogenous flame retardant (urea: ammonium pentaborate =1:1) 13 wt%;
Hydrophilic colloid stabilizer (carbomer: carboxymethyl cellulose=1:1) 4 wt%;
Hydrogen ion concentration buffer (ammonium chloride, acetic acid) 4 wt;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment including the following steps of: (1) preparing aerogel sol: first, perform surface modification for the silica aerogel powder and inlet clean nitrogen at 250°C for heat treatment of 3h; then, add a selected amount of the template agent for mixing and full grinding for 3h; add a proper amount of deionized water and stir for 3h after grinding and mixing, wherein the amount of deionized water 1s no less than 25 wt% of the total amount and the rotation speed of the mixer is controlled to be 150-180 r/min, thereby obtaining needed aerogel sol, which is ready for use;
(2) preparing water-based flame retardant agent: take another amount, which 1s no less than 15 wt% of the total amount, of deionized water and add it to the mixer, then add a selected amount of the phosphorus flame retardant and the nitrogenous flame retardant, adjust the rotation speed of the mixer to be 100-120 r/min, and then add the hydrophilic colloid stabilizer and keep on stirring for 1.0-1.2h, thereby obtaining a stable mixed liquor of water-based flame retardant agent, which 1s ready for use; (3) adjusting pH value: mix the aerogel sol with the mixed liquor of water-based flame retardant agent, and add the mixture to a mixer, adjust the rotation speed of the mixer to be 150-180 r/min and stir for at least 4h at room temperature; deionized water can be supplemented and added to a specified amount during stirring, and is stirred well so as to obtain the uniform mixed liquor; then add the hydrogen ion concentration buffer to adjust the pH value of the mixed liquor to be neutral (6.5-7.5) and maintain the pH value; cure the mixed liquor with adjusted and maintained pH value at room temperature for 8-9h, thereby obtaining the needed fire extinguishing agent product.
Embodiment 7
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica inorganic aerogel powder (a particle size being 20-30 micron) 2 wt%;
Template agent (cetyltrimethylammonium bromide) 9 wt%;
Phosphorous flame retardant (ammonium dihydrogen phosphate) 15 wt%;
Nitrogenous flame retardant (urea: ammonium pentaborate=1:1) 16 wt%;
Hydrophilic colloid stabilizer (Carbomer) 3 wo;
Hydrogen 10n concentration buffer (sodium dihydrogen phosphate, acetic acid)
6 wt%o;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment is the same as that in Embodiment 1.
Embodiment 8
The water-based aerogel efficient fire extinguishing agent in this embodiment, based on the total amount of preparation raw materials, comprises raw material components with the following mass contents:
Silica inorganic aerogel powder (a particle size being 20-30 micron) 10 wt%;
Template agent (cetyltrimethylammonium bromide) 4 wt%;
Phosphorous flame retardant (ammonium dihydrogen phosphate) 18 wt%;
Nitrogenous flame retardant (urea: ammonium pentaborate=1:1) 13 wt%,;
Hydrophilic colloid stabilizer (Carbomer) 5 wt%;
Hydrogen ion concentration buffer (sodium dihydrogen phosphate, acetic acid) 3 wt%;
Deionized water the rest.
According to the preparation flowchart shown in Fig. 1, the preparation method for the water-based aerogel efficient fire extinguishing agent in this embodiment is the same as that in Embodiment 1.
Comparative embodiment 1
The technical solution of the fire distinguishing agent in this comparative embodiment is the same as that in Embodiment 1, and the difference between them merely lies in that silica aerogel powder is directly used in this comparative embodiment without surface modification, while other conditions are the same as those in Embodiment 1.
Test Examples
Tests of fire extinguishing performance
According to the test conditions provided in the paper (“Flow characteristics and effects of water mist fire extinguishing agent modified by nano-S10,”, pages 119-202 in 28™ Supplementary Issue of CHEMICAL INDUSTRY AND
ENGINEERING PROGRESS) written by Xi Yunqin, the fire extinguishing agent m Embodiment 1 and that in Comparative Embodiment 1 were tested. The ignition times (an average of five times is taken) for battens, respectively soaked mm the fire distinguishing agent of Embodiment 1 and in that of Comparative embodiment 1, in direct contact with the flame, as well as extinguishing times for the wood with an ignition time of 60s with a flow rate of the fire distinguishing agent being 0.027kg/s were tested. The results are shown in Table 1. Table 1 further provides the test results where water 1s used for the same test as a contrast.
Table 1 Test results of fire extinguishing performance
According to Table 1, the fire extinguishing agent in Embodiment 1 of the present invention is more efficient in fire extinguishing and has better ignition retardant effects than the fire extinguishing agent in the Comparative embodiment 1, namely, the fire extinguishing agent in Embodiment 1 of the present invention has better flame retardant effects; relative to pure water, Embodiment 1 and
Comparative embodiment 1 both have excellent flame retardant effects.
Fire distinguishing tests were performed for fire distinguishing agents prepared according to Embodiments 1-8, and their fire distinguishing performances were also compared with that of water. A board of 1 mx1 m x1 cm was selected for the fire distinguishing tests, wherein straws with a thickness of about 1 cm was placed on the surface of the board, and fire distinguishing was performed 30s after the straws were ignited. The control time here is the burning time, and the fire distinguishing time is the time needed for each kind of fire distinguishing agent.
The experiment data are shown in Table 2 below.
Table 2 Performance test results of fire extinguishing agents yee 1/2 3 4 ls 6 718
Control time's eee ERR
According to Table 2, the fire distinguishing time for Embodiments 1 to 8 are all less than 10s, which is much faster than that of pure water. It is shown that the fire distinguishing agent prepared according to the present invention is really efficient.
The above embodiments are examples only for clear illustration rather than for limiting. Based on the above illustration, other forms of variation or change can also be made by ordinary technicians in this field. There is no need to nor can exhaustively list all of the embodiments here. Obvious variations or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

P100724NL00 ConclusiesP100724EN00 Conclusions 1. Een op water gebaseerde aerogel efficiënt brandblusmiddel, waarbij het op water gebaseerde aerogel efficiënte brandblusmiddel, gebaseerd op het totale aantal van voorbereidende ruwe materialen voor het brandblusmiddel, omvattende ruwe materiaalcomponenten met de volgende massa-inhouden: Anorganisch aerogelpoeder 2-10 wt%; Modelmiddel 4-9 wt%; Fosfor brandvertrager 15-18 wt; Stikstof brandvertrager 13-16 wt%; Hydrofiele colloidenstabilisator 3-5 wt%,; Waterstofionconcentratiebuffer 3-6 wt%: Water de rest.A water-based airgel efficient fire extinguishing agent, the water-based airgel efficient fire extinguishing agent based on the total number of preparatory raw materials for the fire extinguishing agent, including raw material components having the following mass contents: Inorganic airgel powder 2-10 wt%; Model agent 4-9 wt%; Phosphorus Flame Retardant 15-18 wt; Nitrogen flame retardant 13-16 wt%; Hydrophilic Colloid Stabilizer 3-5 wt%,; Hydrogen ion concentration buffer 3-6 wt%: Water the rest. 2. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens conclusie 1, waarbij het anorganische aerogelpoeder ten minste een van de aerogelpoeders zoals silicoonoxide, alumina, zirconia, silica- aluminium binaire hybride en silica-zirconia binaire hybride, omvat.The water-based airgel efficient fire extinguishing agent according to claim 1, wherein the inorganic airgel powder comprises at least one of airgel powders such as silicon oxide, alumina, zirconia, silica-aluminum binary hybrid and silica-zirconia binary hybrid. 3. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens conclusie 1 of 2, waarbij het modelmiddel omvattende ten minste een van cetyltrimethylammoniumbromide, natriumdodecylbenzeensulfonaat of cetyltrimethylammoniumchloride.The water-based airgel efficient fire extinguishing agent according to claim 1 or 2, wherein the model agent comprises at least one of cetyltrimethylammonium bromide, sodium dodecylbenzene sulfonate or cetyltrimethylammonium chloride. 4. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens een van de conclusies 1 tot 3, waarbij de fosfor brandvertrager een van ammoniumdiwaterstoffosfaat, tri-(2,3-dibromopropyl)-fosfaatester of triisocyanaatthiofosfaat, omvat.The water-based airgel efficient fire extinguishing agent according to any one of claims 1 to 3, wherein the phosphorus fire retardant comprises one of ammonium dihydrogen phosphate, tri(2,3-dibromopropyl) phosphate ester or triisocyanate thiophosphate. 5. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens claim volgens een van de conclusies 1 tot 4, waarbij de stikstof brandvertrager een mengeling van ten minste twee van urea, ammoniumpentaboraat (NH4B50Og:4H;0), ammoniumbicarbonaat (NH4HCO3) of melaminecyanuraat, omvat.The water-based airgel efficient fire extinguishing agent of claim according to any one of claims 1 to 4, wherein the nitrogen fire retardant comprises a mixture of at least two of ureas, ammonium pentaborate (NH4B50Og:4H;0), ammonium bicarbonate (NH4HCO3) or melamine cyanurate. . 6. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens een van de conclusies 1 tot 5, waarbij de hydrofiele colloïdenstabilisator ten minste een van carbomeer, alginaat of carboxymethylcellulose, omvat.The water-based airgel efficient fire extinguishing agent according to any one of claims 1 to 5, wherein the hydrophilic colloids stabilizer comprises at least one of carbomer, alginate or carboxymethylcellulose. 7. Het op water gebaseerde aerogel efficiënte brandblusmiddel volgens een van de conclusies 1 tot 6, waarbij de waterstofionconcentratiebuffer een mengeling van ten minste twee van natriumdiwaterstoffosfaat, dikaliumwaterstoffosfaat, azijnzuur, natriumacetaat, ammoniawater en ammoniumchloride, omvat.The water-based airgel efficient fire extinguishing agent according to any one of claims 1 to 6, wherein the hydrogen ion concentration buffer comprises a mixture of at least two of sodium dihydrogen phosphate, dipotassium hydrogen phosphate, acetic acid, sodium acetate, ammonia water and ammonium chloride. 8. Een voorbereidingsmethode van het op water gebaseerde aerogel efficiënte brandblusmiddel volgens een van de conclusies 1 tot 7, omvattende de volgende stappen: (1) het voorbereiden van aerogeloplossing: het verschaffen van een bepaalde hoeveelheid van aerogelpoeder en inlaatstikstof op 180-250°C voor hittebehandeling van oppervlakmodificatie, het toevoegen van een bepaalde hoeveelheid van het modelmiddel voor het mengen en het volledig vermalen, daarna het toevoegen van water en het goed roeren, waarna de gewenste aerogeloplossing wordt verkregen die klaar is voor gebruik; (2) het voorbereiden van op water gebaseerd brandvertragingsmiddel:A preparation method of the water-based airgel efficient fire extinguishing agent according to any one of claims 1 to 7, comprising the following steps: (1) preparing airgel solution: providing a certain amount of airgel powder and inlet nitrogen at 180-250°C for surface modification heat treatment, adding a certain amount of the model agent for mixing and grinding it completely, then adding water and stirring well, obtaining the desired airgel solution ready for use; (2) preparing water-based fire retardant: het verschaffen van een bepaalde hoeveelheid van de fosfor brandvertrager en de stikstof brandvertrager en het mengen van deze, het toevoegen van water voor het verkrijgen van het volledige mengsel, en het daarna toevoegen van een bepaalde hoeveelheid van de hydrofiele colloïdenstabilisator en het goed roeren, waarna de gewenste vloeistof van op water gebaseerd brandvertragingsmiddel wordt verkregen dat klaar 1s voor gebruik; (3) het aanpassen van pH-waarde: het goed roeren van de verkregen aerogeloplossing en gemengde vloeistof van op water gebaseerd brandvertragingsmiddel, en het toevoegen van de waterstofionconcentratiebuffer zodat de pH-waarde van de vloeistofmengeling neutraal (6,5-7,5) wordt; en (4) het drogen: het drogen van de verkregen vloeistof van gemengde materialen op kamertemperatuur, waardoor het gewenste brandblusmiddel wordt verkregen.providing a certain amount of the phosphorus flame retardant and the nitrogen flame retardant and mixing them, adding water to obtain the complete mixture, and then adding a certain amount of the hydrophilic colloids stabilizer and stirring well, after which the desired liquid of water-based fire retardant is obtained which is ready for use; (3) adjusting pH value: stirring the obtained airgel solution and mixed liquid of water-based flame retardant well, and adding the hydrogen ion concentration buffer so that the pH value of the liquid mixture is neutral (6.5-7.5) is becoming; and (4) drying: drying the resulting mixed materials liquid at room temperature, thereby obtaining the desired fire extinguishing agent. 9. De voorbereidingsmethode van het op water gebaseerde aerogel efficiënte brandblusmiddel volgens conclusie 8, waarbij, in stap (1): de verwerkingstijd voor de hittebehandeling van oppervlakmodificatie voor het aerogelpoeder minstens 3u is; en de verwerkingstijd voor het malen minstens 3u is.The preparation method of the water-based airgel efficient fire extinguishing agent according to claim 8, wherein, in step (1): the surface modification heat treatment processing time for the airgel powder is at least 3 hours; and the processing time for grinding is at least 3 hours. 10. De voorbereidingsmethode van het op water gebaseerde aerogel efficiënte brandblusmiddel volgens conclusie 8 of 9, waarbij, in stap (4), de verwerkingstijd van de maalstap 8-9u is.The preparation method of the water-based airgel efficient fire extinguishing agent according to claim 8 or 9, wherein, in step (4), the processing time of the grinding step is 8-9 hours.
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