WO1999026698A1

WO1999026698A1 - Multipurpose dry powder of extinguishing agent for class a, b, c and d fires

Info

Publication number: WO1999026698A1
Application number: PCT/CN1997/000133
Authority: WO
Inventors: Chaohai Zhou; Sheng Cai Yu; Qiumao Jiang
Original assignee: Chaohai Zhou; Sheng Cai Yu; Qiumao Jiang
Priority date: 1997-11-21
Filing date: 1997-11-21
Publication date: 1999-06-03
Also published as: AU5047098A

Abstract

The invention relates to a multipurpose dry powder of extinguishing agent for class A, B, C and D fires and its production process. The said powder comprises ammonium sulfate 50-80 %, ammonium dihydrogen phosphate 5-30 %, sodium chloride 5-20 %, mica powder 1.5-3 %, active clay 1.5-3 %, the permeating promoter of alkali metal salts of sulfuric acid 2.5-5 %, water repellent silica powder 1.5-3 %, hydrophobic white carbon 1.5-4 % and organosilicone oil 0.2-0.5 %, wherein the sum of all components is 100 % and all the percents herein are weight percents. The process for producing the dry powder of extinguishing agent according to the invention is simple, the raw materials used are readily available with a lower cost and has no pollution to the environment. The dry powder integrates the powder for class A, B and C fires, the powder for class B and C fires with the powder for class B, C and D fires and can extinguish class A, B, C and D fires as well as electrical fires, with a higher extinguishing speed and a higher efficiency, which can be restored for a long time with being efficient and no corrosion.

Description

Full function A B C D dry powder fire extinguishing agent and its production method Field of the invention The present invention relates to a dry powder fire extinguishing agent, especially a full function A B C D dry powder fire extinguishing agent capable of extinguishing Class A, B, C and D fires and its production method. Background technique

Existing dry powder fire extinguishing agents on the market are limited because of their small fire extinguishing range and narrow fire extinguishing types. The only dry powder fire extinguishing agent suitable for extinguishing class A, B and C fires is ammonium phosphate dry powder. First, this dry powder fire extinguishing agent cannot be used to extinguish class D fires, and the types of fire extinguishing are not comprehensive. Second, the existing fire extinguishing The agent uses ammonium phosphate in large quantities. Due to the lack of abundant and unreasonable distribution of phosphate rock resources in our country, the raw materials for its production are more scarce, and the production cost is higher, which makes it difficult to meet the needs of my country's economic development. This contradiction will become more and more prominent along with the continuous improvement of the elimination of (3) alkanes fire extinguishing agent and my country's fire extinguishing technology level.

In the inventor's early Chinese invention patent applications "sodium chloride dry powder fire extinguishing agent and its production method" and "potassium chloride dry powder fire extinguishing agent and its production method", respectively announced the production of sodium chloride and potassium chloride as the main raw materials Dry powder fire extinguishing agent, these two dry powder fire extinguishing agents are suitable for putting out B, C and 1) class fires, but the effect is not good for A class fires. Object of the Invention The object of the present invention is to address the shortcomings of the above-mentioned background technology, and propose a full-featured ABCD dry powder fire extinguishing agent and its production method, so as to improve the fire extinguishing efficiency of the dry powder fire extinguishing agent, expand the fire extinguishing range and fire extinguishing effect of the dry powder fire extinguishing agent variety, while simplifying the production process and reducing production costs. Summary of the invention In order to achieve the above object, the present invention provides a full-featured ABCD dry powder fire extinguishing agent, the composition of which is as follows. Ammonium sulfate 50-80%

Ammonium dihydrogen phosphate 5 - 30 %

Sodium chloride 5 - 20 %

Mica powder 1.5 - 3 %

Activated clay 1.5 - 3 %

Alkali metal sulfate

Penetration enhancer-like 2.5 - 5 %

Hydrophobic silica fume 1.5 - 3 %

Hydrophobic silica 1.5 - 4 %

Silicone oil 0.2 - 0.5 °/ The sum of the components is 100 % and the stated percentages are by weight. According to the full-function ABCD dry powder fire extinguishing agent of the present invention, the alkali metal sulfate-based penetration enhancers sodium sulfate and potassium sulfate are preferably sodium sulfate.

The present invention also provides a method for producing the above-mentioned dry powder fire extinguishing agent, the method comprising the following steps:

a. Mix and dry ammonium sulfate, ammonium dihydrogen phosphate, and sodium chloride;

b. Pulverize the above materials, and then mix and stir;

c. Add activated clay and mica powder, mix and stir for 3-8 minutes, and at the same time fully dissolve the alkali metal sulfate penetration enhancer and spray it on the surface of the material;

d. Add ice-phobic silica powder and mix well;

e. Add silicone oil, mix and stir for 5-10 minutes;

f. Add hydrophobic silica, mix and stir for 3-5 minutes;

g. Stir and dry at 70 - 90 °C for 30 - 50 minutes.

According to the method of the present invention, wherein the composition of each point is as follows: Ammonium sulfate 50-80% Ammonium dihydrogen phosphate 5 - 30 % Sodium chloride 5 - 20 %

Mica powder 1.5 - 3 %

Activated clay 1.5 - 3 %

Alkali metal sulfate

Penetration enhancer-like 2.5 - 5 %

Hydrophobic silica fume 1.5 - 3 %

Hydrophobic silica 1.5 - 4 %

Silicone oil 0.2 - 0.5% Among them, the sum of each component is 100%, and the stated percentages are percentages by weight. According to the method of the present invention, sodium sulfate and potassium sulfate, the alkali metal sulfate penetration enhancers used, are preferably sodium sulfate.

According to the full-featured ABCD dry powder fire extinguishing agent of the present invention, the raw materials used are industrial grade raw materials.

The full-functional ABCD dry powder fire extinguishing agent of the present invention uses ammonium salt as the base material, and through the modification of its physical and chemical properties, it can be used as a dry powder chemical fire extinguishing agent for extinguishing Class A, B, C and D fires and live equipment fires. AB:, BC, BCD dry powder as a whole. Compared with other dry powder fire extinguishing agents such as ammonium phosphate, the full-function ABCD dry powder fire extinguishing agent of the present invention has the characteristics of easy to obtain raw materials, low cost, simple production process, no pollution to the environment, wide fire extinguishing range, fast fire extinguishing speed, and high efficiency. Long-term storage will not fail and will not corrode.

The full-function ABCD dry powder fire extinguishing agent of the present invention also uses a non-toxic inorganic alkali metal sulfate penetration enhancer to better extinguish Class A, B, C and D fires and reduce production costs. After the penetration enhancer is fully dissolved in water, the solution is sprayed on the surface of the base material particles. During the production process, the dry powder with ammonium salt as the main ingredient will form a waxy substance with waterproof properties on the surface of the base material due to the temperature rise of the material movement. The spheres, observed with an electron microscope, found that there is a black ring of nearly 1 mm in the section of the dry powder particles of the present invention. After the siliconization treatment, a denser water-repellent network is formed on the surface of the dry powder particles, which effectively resists the intrusion of water. The water repellency of the dry powder fire extinguishing agent is improved, and performance indicators such as its hygroscopicity are improved. It is precisely because the penetration enhancer forms a layer of wax on the surface of the dry powder The special properties of wax-like spheres prevent the inorganic base material in the dry powder from being exposed, so that the dry powder has the ability of anti-corrosion. A series of chemical reactions can accelerate the inhibition and penetration of combustibles, thus greatly improving the fire extinguishing performance of dry powder, so as to achieve the purpose of waterproof, anti-corrosion, hydrophobic, hydrophobic, oil-repellent and wide range of fire extinguishing, and make the hygroscopic performance, flow Performance, anti-caking performance, etc. can be stabilized within a certain range. The full-function ABCD dry powder fire extinguishing agent of the present invention is different from other dry powders at home and abroad in terms of material selection and process, and its advancement is obvious. EXAMPLES The present invention will be further described below in conjunction with examples of the present invention, but it should be understood that these contents are not intended to limit the scope of the present application.

Examples 1-3 of the present invention adopt the formulations shown in the following table, wherein the alkali metal sulfate penetration enhancer used is sodium sulfate, and all raw materials used are industrial grade, and the dosage is calculated by weight percentage.

Raw materials Example 1 Example 2 Example 3

Ammonium sulfate 50 60 75

Ammonium dihydrogen phosphate 28 6 8

Sodium chloride 12 18 . 5

Mica powder 1.5 3 2.3

Activated clay 2 3 1.5

Alkali metal sulfate

Penetration enhancer-like 2 5 2.5

Hydrophobic silica fume 2 3 1.5

Hydrophobic silica 2 1.6 4

Silicone oil 0.5 0.4 0.2 The production method of the dry powder fire extinguishing agent of the above-mentioned Examples 1-3 is as follows: Mix and dry ammonium sulfate, ammonium dihydrogen phosphate and sodium chloride according to the ratio stated in the table, and pass through the sieve. Add activated clay and mica powder according to the ratio stated in the table, and mix and stir at a temperature of about 70 ° C for about 5 minutes to perform a mixed catalytic reaction. Sodium sulfate was fully dissolved in water, and then the sodium sulfate solution was sprayed onto the surface of the formed mixture material with a pump, and stirred for 8 minutes. Add hydrophobic silicon powder and mix for about 10 minutes. Add silicone oil, stir for about 6 minutes, then add hydrophobic silica, mix and stir for 5 minutes. Stir and dry at about 80 °C for about 40 minutes, and finally pass the dry powder through a sieve with a pore size of 0.250 mm and pack it into bags.

The main performance parameter of dry powder fire extinguishing agent of the present invention is as follows:

Item Standard technical index Test result Bulk density, g/ml 0.90±0.10 0.96

Moisture absorption rate, % <3.00 2.56

Anti-caking (needle >16.0 22.1

degrees), mm

Water repellency No obvious water absorption, no caking No obvious water absorption, no caking Low temperature resistance, second <5.0 1.0

Electrical insulation, kV >5.00 6.54

Jetting performance, % >90.0 96.5

Fire extinguishing efficiency 3 fire extinguishing tests at least 2 times, all 3 fire extinguishing tests are successful

(A, B, C, D) success, no re-ignition and smoldering within 15 minutes after fire extinguishing Note: All tests in the above table are carried out with reference to Chinese national standard GB13532-92, which is equivalent to ISO 7202-88 " Firefighting - Dry Powder Extinguishing Agents" Standard. The dry powder fire extinguishing agent of the present invention has particularly superior fire extinguishing efficiency. In the test process carried out according to the Chinese national standard GB13532-92, the dry powder fire extinguishing agent of the present invention has good permeability when extinguishing Class A fires (wood fires), and the fire extinguishing speed is very fast and does not re-ignite and smolder within 15 minutes after fire extinguishing; When measuring the effectiveness of extinguishing Class B fires, referring to the Chinese national standard GB13532-92, using oil pans with diameters of 1484 mm and 1586 mm respectively, the test results found that the fire extinguishing speed of the two oil pans is equally fast, and the unit The amount of dry powder used in the fire extinguishing area is 40-50% less than that of common dry powder fire extinguishing agents currently on the market. For class C fires, the dry powder fire extinguishing agent of the present invention exhibits performance similar to that of extinguishing class B fires.

The fire extinguishing efficiency of dry powder fire extinguishing agent in extinguishing Class D fire is determined by the following method:

A square steel plate with a wall thickness of 6.0 mm, a side length of 500 mm, and a height of 50 mm is used. The four sides of the plate are reinforced with No. 36 (L36x5) equilateral angle steel. During the test, a metal frame is used to support it. Ground at least 450 mm. The test fuel is magnesium or sodium. The fire extinguishing test is carried out according to the following conditions and steps: Control the test temperature at 0-30 °C, and the wind speed is not greater than 3 m/s; evenly spread 25 mm thick dry sand on the bottom surface of the steel pan; Put 500 grams of metal magnesium or 100 grams of metal sodium in the metal fuel pan; place the metal fuel pan on the dry sand surface in the steel pan; ignite the metal within 20 seconds with an ignition device, and after 30 seconds of pre-combustion, use metal Sprinkle 500 grams of dry powder fire extinguishing agent evenly with the shovel.

According to the above method, the fire extinguishing efficiency of the full-function ABCD dry powder fire extinguishing agent of the present invention in extinguishing Class D fires was measured, and it was found that the full-function ABCD dry powder fire extinguishing agent of the present invention can quickly cover fires when extinguishing fires caused by metal sodium, magnesium, aluminum, etc. area, and rapidly cools the metal, eventually extinguishing the fire without re-igniting the metal.

In the fire extinguishing test carried out on live equipment, the dry powder fire extinguishing agent of the present invention exhibits satisfactory fire extinguishing efficiency. During the dry powder spraying process, the measured 380 volt loop current is less than 0.1 ampere, and the maximum voltage of the fire extinguisher cylinder to the ground is 2.2 volts, which shows that the dry powder fire extinguishing agent of the present invention can completely put out the live equipment fire.

In summary, the present invention has full-function fire extinguishing features, and is suitable for extinguishing Class A, B, C and D fires.

The present invention has been described above by means of the embodiments. However, it should be understood that the scope of protection of the present invention is not limited to the content mentioned above, and those skilled in the art can also make various changes and changes to the present invention without departing from the spirit and principles of the present invention. The content should be considered as belonging to the scope of the present invention.

Claims

- A full-featured ABCD dry powder fire extinguishing agent, including: ammonium sulfate 50' - 80%

Ammonium dihydrogen phosphate 5 - 30 %

Sodium chloride 5 - 20 %

Mica powder 1.5 - 3 %

Activated clay 1.5 -. 3 %

Alkali metal sulfate

Penetration enhancer-like 2.5 - 5 %

Hydrophobic silica fume 1.5 - 3 %

Hydrophobic silica 1.5 - 4 %

Silicone oil 0.2 - 0.5 ' The sum of each component is 100%, and the stated percentages are weight percentages.

2. The dry powder fire extinguishing agent according to claim 1, wherein the alkali metal sulfate penetration enhancer is sodium sulfate and potassium sulfate.

3. The dry powder fire extinguishing agent according to claim 2, wherein the alkali metal sulfate penetration enhancer is sodium sulfate.

1. The production method of the dry powder fire extinguishing agent according to claims 1-3, the method comprises the following steps:

b. Pulverize the above materials, and then mix and stir;

d. Add hydrophobic silicon powder and mix evenly;'

e. Add silicone oil, mix and stir for 5-10 minutes;

f. Add hydrophobic silica, mix and stir for 3-5 minutes;

g. Stir and dry at 70 - 90 °C for 30 - 50 minutes.

5. The method according to claim 4, wherein the dosage ratio of each component is: Ammonium sulfate 50 - 80 % Ammonium dihydrogen phosphate 5 - 30 %

Sodium chloride 5 - 20 %

Mica powder 1.5 - 3 %

Activated clay 1.5 - 3 %

Alkali metal sulfate

Penetration enhancer-like 2.5 - 5 %

Hydrophobic silica fume 1.5 - 3 %

Hydrophobic silica 1.5 - 4 %

Silicone oil 0.2 - 0.5 °/ The sum of each component is 100%, and the stated percentages are by weight. 6. The method as claimed in claim 4, wherein said alkali metal sulfate penetration accelerator is sodium sulfate and potassium sulfate.

7. The method of claim 6, wherein the alkali metal sulfate penetration enhancer is sodium sulfate.