JPS6041978A - Powdery fire extinguishing agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of powder fire extinguishing agents, which significantly enhances the extinguishing ability not only for general fires (Fire A), but especially for oil fires (Fire B) and electrical equipment fires (Fire C). The aim is to reduce costs at the same time.

The main powder extinguishing agents for ABC fires that have been known in the past include ammonium phosphate salts or mixed salts of ammonium phosphate salts and ammonium sulfate salts, and those for Be fires include alkali metal bicarbonate groups and alkali metal chloride salts. However, in general, powder extinguishing agents based on ammonium phosphate salts, which can be applied to all types of fires, are overwhelmingly used.

However, in such conventional products, since the main agent is an acidic substance, there is a problem of secondary damage such as corrosion of equipment after extinguishing, and the extinguishing ability for Be fires is still insufficient compared to the extinguishing ability for A fires. There were problems with it being complete.

Under these circumstances, relatively recently, a powder fire extinguishing agent (trade name: Monex), which is produced by a reaction condensation of urea and potassium bicarbonate in a pressure cooker at high temperature and pressure for a long period of time, has become the UK's first extinguishing agent.
．． It was developed by Company C and I, and was confirmed to bring about a relatively large improvement in extinguishing ability, especially for Be fires.

However, since the above-mentioned products are industrially too expensive, they have hardly been put into practical use as abrasives.

Therefore, the present inventors have conducted various research with the aim of significantly improving the extinguishing ability not only for A fires, but especially for B and C fires, as well as reducing costs and putting them into practical use. As a result, it was found that bromine compounds or bromine compound flame retardants contain bromine in sodium bicarbonate, potassium bicarbonate, and potassium chloride with a bromine content of 0.3 to 35 g in terms of bromine. i
%, we have succeeded in dramatically improving the fire extinguishing efficacy of conventional B and C powder fire extinguishing agents, and at the same time achieving a significant cost reduction.

In other words, the present invention makes it possible to exhibit sufficient extinguishing ability for both B and C fires by adding a bromine compound or central compound flame retardant to the main agent and/or auxiliary agent of the fire extinguishing agent. In this case, bicarbonate, which is the main component of conventional B and C fire extinguishing agents, is used, especially for B and C fires. In addition to the dilution effect of the oxygen concentration, a negative catalytic effect by sodium ions and potassium ions and a negative catalytic effect by the bromine ions generated by thermal decomposition of bromine compounds exert a mutual effect, and as a result, especially against B and C fires, Dramatically improves fire extinguishing ability. Regarding the relationship between combustion and extinguishing, when considering the combustion mechanism using methane as an example, OH- and H+ are called free groups of combustion, and it is said that the larger the number, the faster the combustion (reaction rate).

Here, if there are molecules that are likely to bond with OH- or a%, OH- or H will bond with those molecules and the combustion chain reaction will not be able to continue, so the reaction will stop and the fire will be extinguished. , the extinguishing mechanism of halogenated hydrocarbons and powder extinguishing agents is to supply molecules that are easy to bond with, so when these molecules meet the extinguishing agent, ■ 2 NaHCC) 5 + Flame - + Na2CO3 + C
O2+ H2ONa2CO3 Flame 4 Na 20 + C
02Na2C05+ OH-+ H+-+ 2 NaO
H■ 2 KHCO3+flame → 2CO3+ CO2+
H2O to 2CO3 + flame → 20 + CO2 to 20 + OH-+ H → 2 KOH ■ 2 KCt
Ten flames +2H+→HCt+ 2 KK + OH-+ K
OH When bromine compounds are added to these extinguishing agents, ■ Cl2
Br1 (10+flame-+C1C12I3r+Br-
Furthermore, CCl2Br O + flame → Ct2Br80 + 'f
It continuously and repeatedly generates Br'''' with 3f-, chemically reacts with the above free radicals during combustion, and suppresses the chain reaction of combustion due to the additive effect of the negative catalytic effect. - Dramatically improves extinguishing effectiveness, especially for B and C fires.

Next, the following is an example of a bromine compound or a bromine compound flame retardant added to the main agent and/or auxiliary agent of a fire extinguisher in the present invention.

As a bromine compound, sodium bromide, potassium bromide, ammonium bromide as a flame retardant for bromine compounds: Tris (2,3-dibrom 10bii) phosphate Tris (promchlorophenyl) phosphate Brominated polyphenyltetrabromoethane C2H2Brq Tetra Bromobutane C2H2Brq 1.2 Dibromo-3-chlorobutane CH2Ct-CHBr -CH2Br to 1 2-3 Tribromopronokne CH2Br-CHBr CH2Br 2.2-Bis(4-hydroxy-3,5-tebromophenyl)propane hexabromobenzene r tris(2,3-dibromopropyl)in cyanurate 1C)(2CHBrCH2Br decapromotiphenyl oxide, 2,2-bis(4-hydroxyithioxy-3.5-
Examples of the present invention and its effects will be shown below.

Example 1 Bromine compound or bromine compound flame retardant and 1 carbon 1112
) Potassium bicarbonate and potassium chloride were each finely ground to a particle size of less than 100 mash and mixed with fine silicic anhydride (
white carbon) triple tX and silicone oil 1
After adding fluidity by heating and stirring in exactly the same manner as conventional manufacturing, powder fire extinguishing agents with different bromine content ratios were mixed in appropriate proportions. , B of the agent of the present invention and the conventional powder extinguishing agent using the Puffer fire extinguishing tester (also called a blow extinguishing tester, which has little individual variation and allows for easy comparison of how many tons of agent can extinguish a fire) shown in Figure 1. We conducted a comparative experiment on fire extinguishing performance.

The Putf@r tester uses N-hebutane 400 in the combustion vat.
'rrLt, and 30 seconds after ignition, various powder extinguishing agents were added to the sample chamber of the Puffer box at a nitrogen gas pressure of 0 and 5 kg/d.
Open the butterfly valve at a pressure of -2 to blow the flame in the combustion dish.
We confirmed whether the fire could be extinguished using these chemicals. The results are as shown in the graph of FIG.

In addition, to briefly explain the fire extinguishing tester shown in Figure 1, 1
is a pedestal, 2 is a burning bat, 3 is a stand, 4 is a Puff
er, 5 is a nitrogen gas supply pipe, 6 is a butterfly valve, T is a fire extinguishing agent sample chamber, 7a is a cap, 8 is a pressure gauge, and 9 is a control valve, respectively.

Example 2 Sodium bicarbonate, potassium bicarbonate of Example 1.

Various powder extinguishing agents 3. As a result of conducting a fire extinguishing experiment using a fire extinguisher filled with OKf, the fire extinguishing capacity unit is as follows.

Based on the above results, it has been confirmed that the method is industrially inexpensive, and the extinguishing ability especially for B fires is dramatically improved.

As is clear from the examples given below, according to the present invention, bromine f
By adding a certain amount of a bromine compound flame retardant to the compound, it is possible to bring about the synergistic cross-catalyst effect mentioned above, and as a result, it is industrially inexpensive and is effective against A fires. It is possible to provide a practical dry powder fire extinguishing agent that can dramatically improve the extinguishing effectiveness of KB, C fires.

[Brief explanation of the drawing]

FIG. 1 shows an example of a fire extinguishing test device, in which (A) is a schematic side view, (B) is a partial plane of a combustion bat, and (C') is a Puf
Enlarged view of the fer part & hail. FIG. 2 is a graph showing the fire extinguishing test results according to Example 1. 1... Pedestal 2... Combustion vat 3... Stand 4... Puffar 5... Nitrogen gas supply g 7... Sample chamber 8... Pressure gauge 9...
Control valve-11=

Claims (1)

[Claims] +11 A powder fire extinguishing agent characterized in that a bromine compound or a bromine compound flame retardant is added to the main agent and/or auxiliary agent of the fire extinguisher. (2) In the product described in claim (1), an alkali metal bicarbonate is used as the main ingredient of the fire extinguishing agent. A powder fire extinguishing agent that uses an alkali metal chloride salt. (3) Claim no. Powder fire extinguishing agent.