CN107684682A - A kind of extinguishing chemical for fire extinguisher - Google Patents
A kind of extinguishing chemical for fire extinguisher Download PDFInfo
- Publication number
- CN107684682A CN107684682A CN201610631246.8A CN201610631246A CN107684682A CN 107684682 A CN107684682 A CN 107684682A CN 201610631246 A CN201610631246 A CN 201610631246A CN 107684682 A CN107684682 A CN 107684682A
- Authority
- CN
- China
- Prior art keywords
- carbonate
- extinguishing chemical
- nitrate
- ammonium
- bicarbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- A62D1/0028—Liquid extinguishing substances
- A62D1/0035—Aqueous solutions
- A62D1/0042—"Wet" water, i.e. containing surfactant
-
- 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
- A62D1/0028—Liquid extinguishing substances
- A62D1/005—Dispersions; Emulsions
Abstract
The present invention relates to a kind of extinguishing chemical, its composition is by weight percentage, and at least three kinds of salt containing carbonate, bicarbonate radical, ammonium root, nitrate anion or nitrite anions are 5% 40%, phosphate is 5% 20%, activating agent is 3 15%, and surplus is water.The application by least three or more contain carbonate, bicarbonate radical, ammonium root, the salt of nitrate anion or nitrite anions, and Quadrafos, the compositions such as activating agent, when extinguishing chemical is devoted to the scene of a fire, part composition realizes reaction at low temperature, absorb heat and produce inert gas, have the function that cooling and starvation, with the heat absorption of extinguishing chemical, the composition of higher temperature is needed to start to react, continue to absorb heat and produce inert gas, so that extinguishing chemical has the function that lasting fire extinguishing, simultaneously, it is made up of phosphate and activating agent etc., play covering combustible substance and play fire-retardant effect.
Description
Technical field
The invention belongs to technical field of fire control, particularly relates to a kind of content extinguishing chemical for fire extinguisher.
Background technology
Extinguishing chemical mainly includes three classes, respectively powder extinguishing agent, carbon dioxide extinguishing agent and fire foam, wherein
Carbon dioxide extinguishing agent is because prepare cost height, but traceless feature after putting out a fire, and it is valuable to be mainly used in electric, instrument etc.
The fire of article；Fire foam, which is mainly used in putting out a fire to save life and property, to be unsuitable for being applicable fire, powder extinguishing agents such as the oil products put out a fire with water
In some small-sized fire.But the composition of these three extinguishing chemicals is substantially single, for example powder extinguishing agent is by non-ignitable
Material is covered on comburant to make flame suffocate；Carbon dioxide extinguishing agent is by way of carbon dioxide is come starvation
To reach the purpose of fire extinguishing, same fire foam is also that non-ignitable foam is covered by starvation and in combustible substance
To realize fire extinguishing.
But when fiery formula is larger, the temperature in the scene of a fire is quickly raised so that some incombustible also can at a certain temperature
Enough burnings, so, the fire-fighting efficiency of single extinguishing chemical is relatively low, it is necessary to which substantial amounts of extinguishing chemical could put out a fire, to fire fighter couple
The conveyer belt of extinguishing chemical carrys out larger burden.
Found by scientific research, effectively reduce the temperature in the scene of a fire, the efficiency for improving extinguishing chemical is improved a lot,
Therefore, the fire extinguishing of science should include reducing the temperature in the scene of a fire, starvation and separate comburant to realize quick extinguishing.
Fire scene temperature is reduced, is to reduce scene of a fire temperature by the endothermic reaction by extinguishing chemical in fire extinguishing procedure by research
The effective way of degree, therefore, reaction equation extinguishing chemical is developed, the endothermic reaction is occurred in the scene of a fire by extinguishing chemical, while discharge lazy
Property gas and produce non-combustible matter and be covered in combustible substance, be the research direction of existing extinguishing chemical, now also there is technology to propose such
Extinguishing chemical, such as CN201310302230.9, it is desirable to which protection is a kind of throwing type fire annihilator and preparation method thereof, this technical side
Extinguishing chemical in case be by fluorine surfactant, potassium carbonate, ammonium sulfate, urea, APP, anion surfactant,
Lauryl sodium sulfate and water composition, the technical scheme are that above-mentioned each composition is dissolved in the water of certain temperature to prepare fire extinguishing
Agent, it is by potassium carbonate, ammonium sulfate, urea, APP, anion surfactant, dodecane the advantages of the extinguishing chemical
Base sodium sulphate decomposes such as nitrogen, ammonia and carbon dioxide and goes out inert gas, realize starvation when running into flame, and
Said components can absorb substantial amounts of heat when decomposing, and effectively reduce the temperature of flame, and generation non-combustible matter and surface-active
Agent and lauryl sodium sulfate produce foam, be covered in combustible substance surface realize it is fire-retardant.
But the extinguishing chemical of the technical scheme still has following weak point, first weak point is to prepare middle needs
Hot water, and during fire occurs, the source of hot water can be affected, and then have influence on the efficiency of extinguishing chemical；Second
Weak point is that the decomposition temperature respectively formed in the extinguishing chemical is higher, only when fiery formula is larger, the efficiency ability of extinguishing chemical
Embody, and when fiery formula from the beginning of when, the effect of extinguishing chemical is not high.
The content of the invention
It is larger to solve the use of the extinguishing chemical of prior art needs it is an object of the invention to provide a kind of extinguishing chemical
The problem of reaction condition of fiery formula and extinguishing chemical is higher.
The present invention is achieved by the following technical solutions：
A kind of extinguishing chemical, its composition are that at least three kinds contain carbonate, bicarbonate radical, ammonium root, nitrate anion by weight percentage
Or the salt of nitrite anions is 5%-40%, phosphate 5%-20%, activating agent 3-15%, surplus is water.
Further, the salt containing carbonate is ammonium carbonate, lithium carbonate, sodium carbonate, potassium carbonate, calcium carbonate, carbonic acid
Combination more than one or both of magnesium, barium carbonate, ferric carbonate, manganese carbonate and aluminium carbonate；
The salt of the bicarbonate radical be ammonium hydrogen carbonate, lithium bicarbonate, sodium acid carbonate, saleratus, calcium bicarbonate, magnesium bicarbonate,
Combination more than one or both of barium bicarbonate, bicarbonate iron, bicarbonate manganese and bicarbonate aluminium；
The ammonium root is one or both of urea, ammonium acetate, ammonium halide, ammonium sulfate or ammonium nitrate combination of the above；
The nitrate anion salt be lithium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate, barium nitrate, ferric nitrate, manganese nitrate or
One or both of aluminum nitrate combination of the above；
The nitrite anions salt is lithium nitrite, natrium nitrosum, potassium nitrite, calcium nitrite, magnesium nitrite, barium nitrite, Asia
One or both of ferric nitrate, nitrous acid manganese or nitrous acid aluminium combination of the above.
Further, the phosphate is one or both of APP, polyphosphate sodium or PA 800K above group
Close.
Further, the activating agent is not fluorine-containing activating agent.
The not fluorine-containing activating agent is glycine betaine, OP-10, lauryl sodium sulfate, dodecyl sulphate potassium, dodecane
One or both of base sodium sulfonate or potassium dodecanesulfonate combination of the above.
Further, 0.1-1.0% preservative is included；The preservative is ozone.
Further, 10-50% antifreezing agent is included.
The antifreezing agent is methanol, ethanol, isopropanol, ethylene glycol, propane diols, diethylene glycol (DEG), butyl glycol ether, propane diols
Butyl ether, 2-Butoxyethyl acetate, dichloromethane, 1,1- dichloroethanes, 1,2- dichloroethanes, dimethyl sulfoxide (DMSO), formamide,
One or both of calcium chloride, sodium acetate, magnesium chloride combination of the above.
Further, 0.1-2% size is included.
The size be epoxy resin latex, starch, paraffin, hydrogenated vegetable oil or PPG in one kind or
Two or more combinations.
The beneficial effects of the invention are as follows：
The application by least three or more the salt containing carbonate, bicarbonate radical, ammonium root, nitrate anion or nitrite anions,
And the composition such as Quadrafos, activating agent, when extinguishing chemical is devoted to the scene of a fire, part composition realizes reaction at low temperature,
Absorb heat and produce inert gas, have the function that cooling and starvation, as the heat absorption of extinguishing chemical is, it is necessary to higher temperatures
The composition of degree starts to react, and continues to absorb heat and produces inert gas so that extinguishing chemical has the function that lasting fire extinguishing, together
When, it is made up of phosphate and activating agent etc., plays covering combustible substance and play fire-retardant effect.
Embodiment
Describe technical scheme in detail by the following examples, following embodiment be only it is exemplary, only
Explanation and illustration technical scheme can be used for, and be not to be construed as the limitation to technical solution of the present invention.
The present invention provides a kind of extinguishing chemical, and its composition is that at least three kinds contain carbonate, bicarbonate by weight percentage
Root, ammonium root, the salt of nitrate anion or nitrite anions are 5%-40%, phosphate 5%-20%, activating agent 3-15%, surplus
For water.In this application, water is pure water.
The salt containing carbonate is ammonium carbonate, lithium carbonate, sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, carbonic acid
Combination more than one or both of barium, ferric carbonate, manganese carbonate and aluminium carbonate.
The salt of the bicarbonate radical is ammonium hydrogen carbonate, lithium bicarbonate, sodium acid carbonate, saleratus, calcium bicarbonate, carbonic acid
Combination more than one or both of hydrogen magnesium, barium bicarbonate, bicarbonate iron, bicarbonate manganese and bicarbonate aluminium.
The ammonium root is one or both of urea, ammonium acetate, ammonium halide, ammonium sulfate or ammonium nitrate combination of the above.
In the application, ammonium halide refers to the general name of any one or more combinations in ammonium fluoride, ammonium chloride, ammonium bromide or ammonium iodide.
The nitrate anion salt is lithium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate, barium nitrate, ferric nitrate, nitric acid
One or both of manganese or aluminum nitrate combination of the above.
The nitrite anions salt is lithium nitrite, natrium nitrosum, potassium nitrite, calcium nitrite, magnesium nitrite, nitrous acid
One or both of barium, nitrous acid iron, nitrous acid manganese or nitrous acid aluminium combination of the above.
The phosphate is one or both of APP, polyphosphate sodium or PA 800K combination of the above.
The activating agent is not fluorine-containing activating agent.
The not fluorine-containing activating agent is glycine betaine, OP-10, lauryl sodium sulfate, dodecyl sulphate potassium, dodecane
One or both of base sodium sulfonate or potassium dodecanesulfonate combination of the above.In this application, OP-10 is alkyl phenol polyoxy
Vinethene.
The extinguishing chemical of the application also includes 0.1-1.0% preservative；The preservative is ozone.
The extinguishing chemical of the application also includes 10-50% antifreezing agent.
The antifreezing agent is methanol, ethanol, isopropanol, ethylene glycol, propane diols, diethylene glycol (DEG), butyl glycol ether, propane diols
Butyl ether, 2-Butoxyethyl acetate, dichloromethane, 1,1- dichloroethanes, 1,2- dichloroethanes, dimethyl sulfoxide (DMSO), formamide,
One or both of calcium chloride, sodium acetate, magnesium chloride combination of the above.
The extinguishing chemical of the application also includes 0.1-2% size.
The size be epoxy resin latex, starch, paraffin, hydrogenated vegetable oil or PPG in one kind or
Two or more combinations.
Embodiment 1
A kind of extinguishing chemical, it is formed amounts to 5% for ammonium hydrogen carbonate, potassium carbonate and urea by weight percentage, and APP is
5%, glycine betaine 3%, surplus is pure water.
Preparation method is, dissolved in after ammonium hydrogen carbonate, potassium carbonate, urea, APP and glycine betaine are mixed 87% it is pure
In water purification, extinguishing chemical is made after stirring and dissolving.
Embodiment 2
A kind of extinguishing chemical, it is formed amounts to 5% for ammonium hydrogen carbonate, potassium carbonate and urea by weight percentage, and APP is
5%, glycine betaine 3%, ozone 0.1%, water-soluble epoxy resin emulsion is 0.1%, and surplus is pure water.
Preparation method is, by ammonium hydrogen carbonate, potassium carbonate, urea, APP, glycine betaine, ozone, soluble epoxide tree
Dissolved in after fat liquor mixing in 86.8% pure water, extinguishing chemical is made after stirring and dissolving.
Embodiment 3
A kind of extinguishing chemical, it is formed amounts to 5% for ammonium hydrogen carbonate, potassium carbonate and urea by weight percentage, and APP is
5%, glycine betaine 3%, ethylene glycol 10%, ozone 0.1%, water-soluble epoxy resin emulsion is 0.1%, and surplus is pure
Water purification.
Preparation method is, by ammonium hydrogen carbonate, potassium carbonate, urea, APP, glycine betaine, ethylene glycol, ozone, water solubility
Dissolved in after epoxy resin latex mixing in 76.8% pure water, extinguishing chemical is made after stirring and dissolving.
Embodiment 4
A kind of extinguishing chemical, it is formed amounts to 40% for ammonium hydrogen carbonate, sodium nitrate, potassium carbonate and urea by weight percentage, poly- phosphorus
Sour ammonium is 20%, and glycine betaine 3%, surplus is pure water.
Preparation method is to be dissolved in after mixing ammonium hydrogen carbonate, sodium nitrate, potassium carbonate, urea, APP and glycine betaine
In 37% pure water, extinguishing chemical is made after stirring and dissolving.
Embodiment 5
A kind of extinguishing chemical, it is formed amounts to 40% for ammonium hydrogen carbonate, sodium nitrate, potassium carbonate and urea by weight percentage, poly- phosphorus
Sour ammonium is 20%, and glycine betaine 3%, ozone 1%, surplus are pure water.
Preparation method is to be dissolved in after mixing ammonium hydrogen carbonate, sodium nitrate, potassium carbonate, urea, APP and glycine betaine
In 36% pure water, extinguishing chemical is made in the ozone for adding 1% after stirring and dissolving.
Embodiment 6
A kind of extinguishing chemical, it is formed amounts to 40% for ammonium hydrogen carbonate, sodium nitrate, potassium carbonate and urea by weight percentage, poly- phosphorus
Sour ammonium is 20%, glycine betaine 3%, OP-10 12%, ozone 1%, starch 2%, ethylene glycol 10%, and surplus is pure
Water purification.
Preparation method is, by ammonium hydrogen carbonate, sodium nitrate, potassium carbonate, urea, APP, glycine betaine, OP-10, starch
Dissolved in after mixing in 12% pure water, extinguishing chemical is made in the ozone for adding 1% after stirring and dissolving.
Embodiment 7
A kind of extinguishing chemical, it is formed amounts to 40% for ammonium sulfate, ammonium carbonate, potassium carbonate and urea by weight percentage, polyphosphoric acid
Ammonium is 20%, glycine betaine 3%, OP-10 12%, ozone 1%, starch 2%, ethylene glycol 10%, and surplus is pure
Water.
Preparation method is to mix ammonium sulfate, ammonium carbonate, potassium carbonate, urea, APP, glycine betaine, OP-10, starch
Dissolved in after conjunction in 12% pure water, extinguishing chemical is made in the ozone for adding 1% after stirring and dissolving.
Embodiment 8
A kind of extinguishing chemical, it is formed amounts to 40% for ammonium carbonate, ammonium sulfate, potassium carbonate and urea by weight percentage, polyphosphoric acid
Ammonium is 20%, and glycine betaine 3%, ozone 1%, surplus are pure water.
Preparation method is to be dissolved in after mixing ammonium carbonate, ammonium sulfate, potassium carbonate, urea, APP and glycine betaine
In 36% pure water, extinguishing chemical is made in the ozone for adding 1% after stirring and dissolving.
Embodiment 9
A kind of extinguishing chemical, it is formed amounts to 35% for sodium carbonate, ammonium sulfate, saleratus and urea by weight percentage, poly- phosphorus
Sour ammonium is 15%, OP-10 10%, and ozone 0.5%, ethylene glycol 12%, starch 1%, surplus is pure water.
Preparation method is, by sodium carbonate, ammonium sulfate, saleratus, urea, APP, OP-10, ethylene glycol, starch
Dissolved in after mixing in 26.5% pure water, extinguishing chemical is made in the ozone for adding 0.5% after stirring and dissolving.
Embodiment 10
A kind of extinguishing chemical, it is formed amounts to 32% for sodium carbonate, ammonium sulfate, saleratus and urea by weight percentage, poly- phosphorus
Sour ammonium is 10%, OP-10 15%, and ozone 0.5%, ethylene glycol 10%, starch 1%, surplus is pure water.
Preparation method is, by sodium carbonate, ammonium sulfate, saleratus, urea, APP, OP-10, ethylene glycol, starch
Dissolved in after mixing in 31.5% pure water, extinguishing chemical is made in the ozone for adding 0.5% after stirring and dissolving.
Embodiment 11
A kind of extinguishing chemical, it is formed amounts to 20% for potassium carbonate, ammonium hydrogen sulfate, potassium nitrate and urea by weight percentage, poly- phosphorus
Sour ammonium is 15%, OP-10 10%, and ozone 0.5%, ethylene glycol 12%, starch 1%, surplus is pure water.
Preparation method is, by potassium carbonate, ammonium hydrogen sulfate, potassium nitrate, urea, APP, OP-10, ethylene glycol, starch
Dissolved in after mixing in 41.5% pure water, extinguishing chemical is made in the ozone for adding 0.5% after stirring and dissolving.
It the above is only the limited embodiments to the technical program, and all embodiments can not be enumerated.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (10)
- A kind of 1. extinguishing chemical for fire extinguisher, it is characterised in that：Its composition is that at least three kinds contain carbon by weight percentage Acid group, bicarbonate radical, ammonium root, the salt of nitrate anion or nitrite anions are 5%-40%, phosphate 5%-20%, activating agent are 3-15%, surplus are water.
- 2. extinguishing chemical according to claim 1, it is characterised in that：The salt containing carbonate is ammonium carbonate, carbonic acid One or both of lithium, sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, barium carbonate, ferric carbonate, manganese carbonate and aluminium carbonate with On combination；The salt of the bicarbonate radical is ammonium hydrogen carbonate, lithium bicarbonate, sodium acid carbonate, saleratus, calcium bicarbonate, carbon Combination more than one or both of sour hydrogen magnesium, barium bicarbonate, bicarbonate iron, bicarbonate manganese and bicarbonate aluminium；The ammonium Root is one or both of urea, ammonium acetate, ammonium halide, ammonium sulfate or ammonium nitrate combination of the above；The nitrate anion salt is One kind in lithium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate, barium nitrate, ferric nitrate, manganese nitrate or aluminum nitrate or two Kind combination of the above；The nitrite anions salt is lithium nitrite, natrium nitrosum, potassium nitrite, calcium nitrite, magnesium nitrite, Asia One or both of barium nitrate, nitrous acid iron, nitrous acid manganese or nitrous acid aluminium combination of the above.
- 3. extinguishing chemical according to claim 1, it is characterised in that：The phosphate is APP, polyphosphate sodium or poly- One or both of potassium phosphate combination of the above.
- 4. extinguishing chemical according to claim 1, it is characterised in that：The activating agent is not fluorine-containing activating agent.
- 5. extinguishing chemical according to claim 4, it is characterised in that：The not fluorine-containing activating agent is glycine betaine, OP-10, ten It is more than one or both of sodium dialkyl sulfate, dodecyl sulphate potassium, dodecyl sodium sulfate or potassium dodecanesulfonate Combination.
- 6. extinguishing chemical according to claim 1, it is characterised in that：Also include 0.1-1.0% preservative；The anti-corrosion Agent is ozone.
- 7. extinguishing chemical according to claim 1, it is characterised in that：Also include 10-50% antifreezing agent.
- 8. extinguishing chemical according to claim 7, it is characterised in that：The antifreezing agent is methanol, ethanol, isopropanol, second two Alcohol, propane diols, diethylene glycol (DEG), butyl glycol ether, propandiol butyl ether, 2-Butoxyethyl acetate, dichloromethane, the chloroethenes of 1,1- bis- One or both of alkane, 1,2- dichloroethanes, dimethyl sulfoxide (DMSO), formamide, calcium chloride, sodium acetate, magnesium chloride above group Close.
- 9. extinguishing chemical according to claim 1, it is characterised in that：Also include 0.1-2% size.
- 10. extinguishing chemical according to claim 9, it is characterised in that：The size is epoxy resin latex, starch, stone One or both of wax, hydrogenated vegetable oil or PPG combination of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610631246.8A CN107684682A (en) | 2016-08-04 | 2016-08-04 | A kind of extinguishing chemical for fire extinguisher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610631246.8A CN107684682A (en) | 2016-08-04 | 2016-08-04 | A kind of extinguishing chemical for fire extinguisher |
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| Publication Number | Publication Date |
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| CN107684682A true CN107684682A (en) | 2018-02-13 |
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|---|---|---|---|
| CN201610631246.8A Pending CN107684682A (en) | 2016-08-04 | 2016-08-04 | A kind of extinguishing chemical for fire extinguisher |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110841237A (en) * | 2019-11-19 | 2020-02-28 | 西安科技大学 | Preparation method and application of water mist additive for inerting and inhibiting coal mine fire |
| CN111040677A (en) * | 2019-12-31 | 2020-04-21 | 宁波大榭开发区综研化学有限公司 | Flame retardant, flame-retardant adhesive composition, flame-retardant adhesive tape and preparation method thereof |
| EP3960252A1 (en) * | 2020-08-27 | 2022-03-02 | Fu-An Hung | Process of producing extinguishing agent |
| CN115109493A (en) * | 2022-08-05 | 2022-09-27 | 重庆消防安全技术研究服务有限责任公司 | Thermal expansion type fireproof coating prepared from waste dry powder extinguishing agent and preparation method thereof |
-
2016
- 2016-08-04 CN CN201610631246.8A patent/CN107684682A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110841237A (en) * | 2019-11-19 | 2020-02-28 | 西安科技大学 | Preparation method and application of water mist additive for inerting and inhibiting coal mine fire |
| CN111040677A (en) * | 2019-12-31 | 2020-04-21 | 宁波大榭开发区综研化学有限公司 | Flame retardant, flame-retardant adhesive composition, flame-retardant adhesive tape and preparation method thereof |
| CN111040677B (en) * | 2019-12-31 | 2021-11-12 | 宁波大榭开发区综研化学有限公司 | Flame retardant, flame-retardant adhesive composition, flame-retardant adhesive tape and preparation method thereof |
| EP3960252A1 (en) * | 2020-08-27 | 2022-03-02 | Fu-An Hung | Process of producing extinguishing agent |
| CN115109493A (en) * | 2022-08-05 | 2022-09-27 | 重庆消防安全技术研究服务有限责任公司 | Thermal expansion type fireproof coating prepared from waste dry powder extinguishing agent and preparation method thereof |
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Application publication date: 20180213 |