JP6516268B2 - Thermosensitive inorganic composition fire extinguishing agent and thermosensitive inorganic composition fire spread suppressing agent - Google Patents

Description

  The present invention relates to a fire extinguishing agent and a fire spread suppressing agent of an inorganic composition comprising a thermosensitive composition based on a silicate compound which forms a solid inorganic polymer film or foam under high temperature environment such as fire. .

  Water, a powder extinguishant (non-patent document 1), a strengthening liquid (patent document 1), a foam extinguishant (patent document 2), and the like are known as typical extinguishing agents conventionally known.

  Water as a fire extinguishing agent, from the research on quantification of fire extinguishing mechanism and fire extinguishing ability (Non-patent documents 2 to 5), development of mechanical spraying (Patent document 3), and research on restoration when cultural property is lost (non- A very wide range of research and development has been carried out up to Patent Document 6).

  Due to the low cost and wide area of the fire hydrant installed, although water with a working environment is used most frequently, on the other hand, objects that should have been extinguished with water will reburn after evaporation of the water It has a drawback.

  The powder extinguishing agent containing an ammonia component suppresses the chain reaction of combustion by ammonia radicals generated by thermal decomposition (Non-Patent Document 1) and exhibits the ability to extinguish, but the oxygen concentration of the sprayed space region is Depending on the wind direction, the fire brigade's activities may be limited because it is reduced by the radical termination reaction.

  In addition, it has been pointed out that it is difficult to cope with quick fire-extinguishing activities, since the powder extinguishant has a drawback that it absorbs moisture during storage and solidifies (Non-Patent Document 1).

  The strengthening solution is an excellent fire extinguishing agent because it has excellent fire extinguishing effect in A fire and saponification of oil in B fire, and it is an excellent extinguishing agent, but it extinguishes on the surface of the material that should extinguish after drying in A fire. Since the component contained in a liquid turns into powder, it has the fault (patent document 4) which can not prevent recombustion.

  In the foam extinguishing agent (Patent Document 2), the surface tension derived from the surfactant reduces the water efficiently to be attached to the combustion material, and the effect of cooling the heat of vaporization by the water and the surface of the combustion material due to the liquid foam It has an excellent ability to extinguish asphyxiation due to its coating. However, surfactants having both lipophilicity and hydrophilicity in principle are considered to have problems with the environment and fish.

  As described above, the respective extinguishing agents are respectively useful and also have their respective drawbacks. At present, it is considered that the development of fire extinguishing agents that are good in fire extinguishing performance and environmentally friendly is desired for fires.

  In the case of silicate compounds, recently, there have been some reports of fire extinguishing agents containing silicate compounds, which also consider the performance of environment-friendly fire extinguishing ability. In Patent Document 5, two fire extinguishers are prepared for the first model used in preparing a fire extinguishing material by mixing it with a clay mineral such as smectite and water, or a fire extinguishing fluid and measuring the capacity unit of A fire. I tried to extinguish the fire, and it was said that the wood was completely extinguished with carbonizing. This fire extinguishing effect is due to the asphyxiation effect in which the clay mineral which can not be chemically condensed is simply gelled and adhered to the combustion surface, and the cooling effect due to the evaporation of water.

  Since the silicate compound of Patent Document 5 is a clay mineral itself, it can not form a solid film or a solid foam derived from the formation of a silicate layer by dehydration condensation reaction utilizing heat at the time of fire on the surface of a combustion material Are different from the present invention.

  In Patent Document 6, a suspension prepared by mixing water, water glass and clay is used as a extinguishing agent. At this time, the water glass acts as a clay dispersion stabilizer. The action of the addition of the water glass of Patent Document 6 is to aggregate sand and to retain water in the aggregate sand. Therefore, the basic fire extinguishing action is sand extinguishing in which clay adheres to the burning matter.

  Because the fire extinguishing principle is sand fire extinguishing, if the total content of clay and water glass becomes large (as it is the same as putting sand on a burning material), the fire extinguishing effect is said to be high. In Patent Document 6, the silicic acid compound only exerts an action as a binder of sand, but does not exert a direct fire-extinguishing effect on the combustion material.

  The fire extinguishing agent using a silicate compound described in these documents (Non-patent document 5 and Non-patent document 6) is a suspension of a clay mineral which does not dissolve in water. There is also the problem that it is inappropriate in light of the "Ministry of Ordinance for Establishing Technical Specifications of Fire Extinguishers for Fire Extinguishers" based on the provision of paragraph 2, paragraph (2).

  Patent Document 7 describes that dry water glass is used by being limited to an oil tank fire. A reticulated aggregate is coated with water glass and dried to form a hollow floating body, into which a structure filled with cullet dried water glass is connected and floated in an oil tank. The heat generated by the oil fire collapses the shell of the floating body, and the inside cullet leaks and foams to cover the oil surface.

  Patent Document 7 discloses a chemical problem in which non-foaming silicic acid precipitates on a solid-oil contact interface when water glass comes into contact with an organic solvent, and further, it is known that the specific gravity of commercially available water glass is about 1.5. It is obvious that the dried product has an even higher specific gravity, and there is a physical problem that the settling speed is fast even if the water glass dried cullet is present at the gas-liquid interface of oil whose specific gravity is smaller than 1.0.

  Even if the heat of fire starts foaming, the dried water glass cullet placed on light oil with low specific gravity is always blocked by silica generated at the solid oil contact interface, and the foaming remains insufficient Most of the cullet also has the kinetic problem of sinking in oil.

  With regard to foam extinguishing agents, foam extinguishing agents that are considered to be most effective for suffocating action of extinguishing have been developed based on surfactants and are already commercially available. However, it also has disadvantages as described in Patent Document 2. However, fire extinguishing agents are being developed which are currently solving the drawbacks of foam extinguishing agents.

  A foam extinguishant having high safety for the human body (Patent Document 8) and a foam extinguishant having a low impact on organisms and the environment (Patent Document 9) have been developed. These superiorities are high, and it is considered that the drawbacks of the foams that have been recognized until now are almost cleared. However, the foam of these foams is a liquid foam derived from a surfactant. Considering the state of the liquid foam at the time of fire, if the heat of the fire is supplied to the liquid foam, the water of the skeletal component that forms the foam evaporates, and the foam structure can not be maintained.

  Thus, the foam skeleton maintenance temperature to the heat of the liquid foam is until the water evaporates. Also, the formation of the foam is a foam extinguishing agent that is forcedly generated through a dedicated nozzle or mixing device, and the phenomenon of spontaneous foaming without feeling the heat of the fire can not occur. On the other hand, considering the liquid foam after the fire extinguishing is completed, it is possible to maintain the liquid foam to some extent without being exposed to the heat of the fire, but this has also been reported to defoam in about 5 hours (Non-patent Document 7) is there.

  Thus, the defoaming of the liquid foam is due to the evaporation of water, and the composition of the foam can not actively control the maintenance of the foam skeleton.

Japanese Patent Laid-Open No. 3-500252 JP, 2009-201695, A JP 11-146928 A JP, 2006-130210, A JP-A-7-558 Japanese Patent Publication No. 2000-512517 JP 2008-206849 A JP, 2009-291636, A JP 2012-254101 A

Wakazono Yoshikazu, Ando Naojiro; on fire extinguishing (Part 2) Powder fire extinguishing agent, Annual report of the Kyoto University Disaster Prevention Research Institute, 6, pp1-5 (July 1958). Takahashi, Tetsu; Quantification of fire extinguishing phenomena of crib model fires, Proceedings of the Japan Society of Fire Science, 29, pp. 33-40 (1979). TAKAHASHI Satoshi; Firefighting of burning charcoal, Fire Research Institute Report, 49, pp. 7-13 (1980). TAKAHASHI Satoshi; Fire extinguishing of wood fires-Weight increase rate and extinguishing time of water injection-, Proceedings of the Fire Society of Japan, 30, pp. 31-40 (1980). Takahashi, T .; "Action mechanism and efficiency of water extinguishing agents, Report of Fire Research Institute, 56, pp. 7-11 (1983). Takatsuma Yosei; Treatment of water loss materials, Emergency Maintenance Activities / Current Situation Research Project Study Group, "Preparing for cultural property disaster prevention-preparation for disaster prevention" session 1 Technical findings and problems obtained after rescue, National administrative culture National culture National Institute of Technology Tokyo National Research Institute for Cultural Properties (2015). Muroda, J .; Reform of fire fighting tactics using Class A foam extinguishant, 輯, D. Department of Fire and Disaster Prevention Scientific Papers by the General Public, pp. 106-113 (FY 2002).

  In the present invention, a temperature-sensitive inorganic composition that forms a solid film or a solid foam is used as a fire extinguishing agent for a substance that has already burned due to a fire or the like, and a fire spread suppressing agent for an unburned substance that may spread fire. Intended to be provided.

As a result of intensive research to achieve the above object, the present inventors
Single or mixed solution of sodium silicate and potassium silicate,
A solution in which aluminum silicate is dissolved in sodium silicate and potassium silicate singly or in combination,
A solution of an alkali carbonate alone or a mixture in a solution of sodium silicate and potassium silicate alone or in a mixture, or a solution of an aluminum silicate and an alkali carbonate alone or in a mixture of sodium silicate and potassium silicate alone or a mixture The thermosensitive inorganic composition prepared as a solution etc. in which
To function as a fire extinguishing agent that senses heat such as fire and forms a solid film or a solid foam or a mixture of solid bubbles on the surface of the combustion material to exhibit a extinguishing action;
Functioning as a fire spread suppressing agent which exerts a fire spread suppressing effect by supplying in advance the temperature sensitive inorganic composition to unburned substances which may spread fire;
It has been found that the phenomenon of liquefaction and / or retention of a solid film and a foam alone or a mixture of a solid film and a foam appear as the temperature decreases after the extinguishment, and the present invention has been completed.

  That is, the present invention includes the following inventions.

Thermosensitive inorganic composition fire extinguishant according to the first invention .
A temperature-sensitive inorganic composition fire extinguisher comprising an alkali metal silicate compound and 0 to 26 parts by weight of aluminum silicate and water with respect to 100 parts by weight of the solid content of silicon dioxide of the alkali metal silicate compound.

Item 2.
An alkali metal silicate compound, and 0 to 26 parts by weight of aluminum silicate, a metal carbonate having a saturation concentration or less, and water with respect to 100 parts by weight of the silicon dioxide solid content of the alkali metal silicate compound Temperature-sensitive inorganic composition fire extinguisher.

Item 3.
3. The thermosensitive inorganic composition fire extinguisher according to item 1 or 2, wherein the alkali metal silicate compound is at least one compound selected from the group consisting of sodium silicate, potassium silicate and lithium silicate.

Item 4.
The metal carbonate is an alkali metal carbonate and an alkali metal hydrogen carbonate, and the alkali metal is at least one compound selected from the group consisting of sodium, potassium and lithium. Temperature-sensitive inorganic composition fire extinguisher described.

Thermosensitive inorganic composition fire retardant according to the second invention [ 5].
A temperature-sensitive inorganic composition as claimed in any one of claims 1 to 3, which comprises an alkali metal silicate compound and 0 to 26 parts by weight of aluminum silicate and water with respect to 100 parts by weight of the silicon dioxide solid content of the alkali metal silicate compound.

Item 6.
A sense of containing an alkali metal silicate compound, 0 to 26 parts by weight of aluminum silicate, a metal carbonate having a saturation concentration or less, and water with respect to 100 parts by weight of the solid content of silicon dioxide of the alkali metal silicate compound Thermal inorganic composition Flame retardant.

Item 7.
7. The heat-sensitive inorganic composition according to item 5 or 6, wherein the alkali metal silicate compound is at least one compound selected from the group consisting of sodium silicate, potassium silicate and lithium silicate.

Item 8.
The metal carbonate is an alkali metal carbonate and an alkali metal hydrogen carbonate, and the alkali metal is at least one compound selected from the group consisting of sodium, potassium and lithium Temperature-sensitive inorganic composition fire retardant as described.

Item 9 of the Invention
9. A paint comprising a substrate having the temperature-sensitive inorganic composition fire extinguishing agent or the temperature-sensitive inorganic composition fire spread suppressing agent according to any one of items 1 to 8.

  According to the present invention, by supplying a temperature-sensitive inorganic composition having a specific composition to a substance that burns in the event of a fire, the cooling effect of the heat of vaporization by water in the extinguishant is exhibited.

  In addition, by supplying a temperature-sensitive inorganic composition having a specific composition to a substance that burns in the event of a fire, formation of a solid film or a solid foam singly or in a mixture on the surface of the combustible substance (hereinafter referred to as a coating) You can also extinguish the fires by exerting asphyxiation effect.

  According to the present invention, the liquid extinguished substance can prevent reburning by blocking the supply of oxygen to the combustible substance by the coating.

  For substances supplied with this temperature-sensitive inorganic composition, the fire extinguishing fluid-derived silicate layer formed by the heat of fire, physically fixes the substance that has been liquid-covered (such as extinguished charcoal) Therefore, it can contribute to the prevention of the flaking of high-temperature charcoal and fire-extinguishing charcoal in roofs and trees.

  By this action, it is also possible to suppress the spread of fire in strong winds. It can also be used to treat fire after forest field fires.

  On the other hand, when the environmental temperature drops after extinguishing, in the case of the thermosensitive inorganic composition having deliquescent property, the solid forming the coating is changed to a liquid or partially liquefied, and further, the composition is optionally set. Can also be held by

  If these effects are considered together, it can be applied to the use for peat fire and prevention. Furthermore, by providing the temperature-sensitive inorganic composition to the combustibles before burning in advance, it is possible to form a film on the surface of the predicted fire spread and suppress the fire spread.

  According to the present invention, a temperature-sensitive inorganic composition fire extinguisher and a temperature-sensitive inorganic composition fire spread suppressing agent, which have the above-described effects, are provided.

It is an elevation view of the fire extinguishing object (crib) used in the fire extinguishing experiment. It is a figure which shows a time-dependent change of the thermal behavior which filled each fire extinguishing fluid to the manual spray and extinguished the crib shown in FIG. It is a figure which shows the time-dependent change of the thermal behavior which filled each fire extinguishing fluid which changed the moisture content of the same composition into a sprayer, changed the viscosity, and extinguished the crib shown in FIG. It is a figure which shows the time-dependent change of the thermal behavior which filled each fire extinguishing solution which prepared the density of aluminum silicate to mixed sprayer by changing the density | concentration of aluminum silicate, substantially equalized viscosity, and extinguished crib shown in FIG. . Photo 1: In an electric furnace heated to 700 ° C, the moisture content of the same composition was changed, the fire extinguishing liquid with changed viscosity was sprayed on a slide glass, and it was put in a wet state and photographed after heating It is a photograph. Photo 2: A fire extinguishing solution of the same composition is naturally dried on a slide glass, and samples prepared to have different moisture contents are placed in an electric furnace at room temperature, and then the temperature in the furnace is raised at 20 ° C / min. It is the photograph which photographed the appearance of the solid bubble in each arbitrary temperature of. Photo 3: Change the water content of the fire extinguishing solution of the same composition, load approximately the same amount on a slide glass and pre-dry it, place it in an electric furnace and raise it from room temperature at 20 ° C / min. It is the photograph which image | photographed the appearance of deliquesce sequentially over time by making the time of taking out the sample from the electric furnace as the start time, after creating each sample which kept it warm and kept at 600 ° C. for 4 hours and was in the non-drying state.

  The thermosensitive inorganic composition fire extinguishing agent and thermosensitive inorganic composition fire spread suppressing agent of the present invention include sodium silicate and potassium silicate singly or in combination, aluminum silicate and metal carbonate, and any from liquid to solid state It can be adjusted to the form.

  The inorganic substance cools the combustion material by the heat of vaporization of water when supplied to the combustion material, and the heat in the environment being extinguished causes a solid film or solid foam having a siloxane molecular structure on the surface of the combustion material. Generate

  The coating according to the present invention stably covers the surface of the combustion material and the temperature at which water evaporates, since the heat in the environment is kept stable in the temperature range of 100 ° C. to less than about 850 ° C. Even if it becomes above, the asphyxiation effect is maintained. In addition, the coating of the burning portion contributes to the dispersion of the flame by preventing the generation of the flame from the adhering portion, so that the effect of removing the fire is also exhibited.

In addition, since the product of the present invention does not contain any organic compound (surfactant, chelating agent, metal fatty acid, etc.) which is harmful at the time of thermal decomposition, it is a safe material which does not generate harmful smoke or gas derived from the product of the present invention. is there. Assuming that the main component, the silicate compound, is melted by the heat of fire, the generated fume is amorphous SiO ₂ and this fume adsorbs the moisture on the skin surface when it touches human skin, it becomes dry It feels like it, but you just have to rinse it out with water.

  As described above, when a silicate compound is used as a starting material of a fire extinguishing agent, an environment almost free from human harm due to thermal decomposition at the time of fire can be created. In addition, in the product of the present invention, which is optionally prepared to exhibit deliquescence, when the temperature drops after extinguishing, deliquescence of the skeletal material forming the coating starts, and the saturated water vapor pressure of the skeletal component and the water vapor pressure in the atmosphere are Absorb water until it is equal.

  In the product of the present invention, the skeletal component is exposed only at the beginning of the onset of the deliquescence phenomenon, but thereafter the skeletal component is covered with liquid, so the skeletal component proceeds until it is dissolved by deliquescence. Due to this phenomenon, the coating formed by heat such as fire liquefies by returning to the outside temperature.

  Furthermore, by supplying the extinguishant continuously or intermittently to the flammable spread prediction before burning in advance, a coating precursor or coating is formed on the surface of the spread prediction, and a fire is generated. It is possible to reduce the heat from the fire and to prevent the spread of fire.

  The product of the present invention can usually be prepared by mixing a silicate compound solution with aluminum silicate, metal carbonate and the like, and adjusting it to an arbitrary water content according to the purpose.

  The moisture content of the temperature-sensitive inorganic composition extinguishant and the temperature-sensitive inorganic composition fire spread suppressing agent may be in the range that does not impair the object, and is usually 7 to 95%.

In the present invention, “silicate” refers to potassium silicate, sodium silicate and lithium silicate, and each of K ₂ O.nSiO ₂ (n = 1.8 to 3.7) and Na ₂ O.nSiO ₂ (n And Li ₂ O.nSiO ₂ (n = 3-8) (formula mH ₂ O omitted), coefficient n is a value described in the parenthesis attached to each composition formula Represents a compound.

  The pH of the product of the present invention can also be adjusted by diluting the "silicic acid compound" with water.

  Further, the pH may be adjusted by diluting the "silicate compound" with a saturated solution of "metal carbonate" described later, and water may be further added to the diluted product to adjust the pH.

  In business, it is usually preferred to prepare at pH less than 12.5.

  Depending on market needs, the temperature sensitive inorganic composition fire extinguisher or the temperature sensitive inorganic composition fire spread inhibitor may be prepared while maintaining the pH of the raw material as it is, the silicic acid compound.

  The "silicic acid compound" may be a mixture of a plurality of silicic acid compounds. If the concentration of sodium silicate is higher than the concentration of coexisting silicic acid, the adhesion to the combustion product becomes strong, and the spreading of the liquid becomes slightly worse.

  If the concentration of potassium silicate is higher than the concentration of the co-silicating compound, the adhesion to the combustion material is somewhat weak but the spreading of the liquid is better. If the concentration of lithium silicate is higher than the concentration of the coexisting silicate compound, the adhesion to the combustion material is weakened and the spreading of the liquid is improved.

  In consideration of these characteristics, the basic characteristics can be designed according to the purpose and application of the extinguishant and the fire spread inhibitor.

  Water is included in the range which does not impair the object of the temperature-sensitive inorganic composition fire extinguishing liquid and the temperature-sensitive inorganic composition fire spread suppressing liquid of the present invention.

  By adding "aluminum silicate", it is possible to control the high-temperature skeleton maintaining property of a solid film or a solid foam formed by heat such as a fire, and further control the extinction property when sprayed.

  The addition amount of aluminum silicate is 26 parts by weight or less, preferably from 0.1 parts by weight to 5.5 parts by weight from the viewpoint of cost, with respect to 100 parts by weight of the solid content of the silicate compound. There is not.

  Aluminum silicate can be omitted depending on the purpose and application, but when the addition amount of aluminum silicate increases, the fire extinguishing and fire spread suppressing effects also become high.

  The "metal carbonate" is not particularly limited as long as it is water soluble, and examples thereof include potassium carbonate, potassium hydrogen carbonate, sodium carbonate and sodium hydrogen carbonate.

  Potassium carbonate and potassium hydrogen carbonate have a solubility of about 52 g and about 28 g in water at 30 ° C., respectively, and are easily dissolved in a silicate compound solution. By adding these, it is possible to adjust the viscosity of the product of the present invention as well as to control the stickiness of the product to the combustible substance, and also to adjust the pH of the product of the present invention.

  Sodium carbonate and sodium hydrogen carbonate have a solubility in water of 30 ° C. of about 31 g and about 10 g, respectively, and easily dissolve in a silicate compound solution. By adding these, it is possible to adjust the viscosity of the product of the present invention, and also to control the dry feeling of wetness to the combustion material, and also to adjust the pH of the product of the present invention.

  The upper limit of the amount of “metal carbonate” added is the amount of dissolution of each of the metal carbonates described above. In general, work efficiency is good if the pH when dissolved in water is less than or equal to the concentration with an upper limit of less than 12.5. These can be used alone or in combination depending on the purpose and application.

  By controlling the moisture content of the product of the present invention containing the above-mentioned additive, it is possible to control the shape of a solid film or a solid foam or a composite formed at the time of extinguishment.

  Furthermore, by controlling the pH of the product of the present invention containing the above-mentioned additive, the degree of deliquescent after extinguishing can be controlled.

  In the present specification, "containing 0 to X parts by weight" means that the composition may contain up to X parts by weight of the target component, or in the case of 0 parts by weight, it may not be contained. Thus, for example, in the present specification, "containing 0 to 26 parts by weight" of aluminum silicate means that the composition of the present invention is aluminum silicate to 100 parts by weight of solid content of silicon dioxide of sodium silicate. Is meant to include or not include at most 26 parts by weight.

  The thermosensitive inorganic composition fire extinguishant and the thermosensitive inorganic composition fire spread suppressing agent of the present invention can be used alone or in combination to prepare a paint using the composition as a base material. At that time, known additives and water as a solvent can be added within the range not impairing the object of the present invention.

  As the additive, for example, a pigment, a desiccant, a flowability regulator, an ultraviolet light absorber, an anti-sagging agent, a heat resistance improver and the like can be used.

  The method of forming a coating film with the above-mentioned temperature-sensitive inorganic composition fire extinguishing agent and temperature-sensitive inorganic composition fire spread suppressing agent comprises a doctor blade method, gel casting method, cast molding method, calender method, spray coating method for composition aqueous solution. It can be applied by a known method such as a roller coating method, a bar coating method, an air knife coating method, a brush coating method, a dipping method and the like, and can be naturally dried or forcedly dried.

  The thickness of the dried temperature sensitive inorganic composition fire extinguishing liquid and the temperature sensitive inorganic composition layer of the fire retardant composition formed on the surface of the building member etc. is not limited as long as the object of the present invention is not impaired. 50 μm to several tens of mm. For the purpose of improving the durability of the coating, it is preferable to form a silicate layer by heat treatment at 120 ° C. or higher.

  On the other hand, when the durability of the coating film is not necessary and the deliquescent property is prioritized, the heating after the coating film is not necessary. In addition, this unheated processed dry coating film develops deliquescent in all the compositions described in the present specification.

  Hereinafter, the present invention will be described in detail by way of examples. In the present invention, for the purpose of the present invention, modifications or partial changes and additions are optional as long as the effects of the present invention are not particularly impaired, and all are within the scope of the present invention. .

Test method Test is based on the Ministry of Land, Infrastructure, Transport and Tourism designated performance evaluation in accordance with the international standard (ISO / CD12468 Test method for external fire exposure to roofs) Designated contractor establishment “Fireproof performance test and evaluation business procedure manual” 4.13 The target area described in the performance test and evaluation method used a crib (Figure 1) using beech wood designated as "Buildings in Fire Zone and Quasi-Fire Zone (Article 63 of Building Standard Act)".

  The dimensions of the crib single wood are 19 mm in length × 19 mm in width × 180 mm in width. As shown in FIG. 1, the assembled dimensions when using 3 stages of each step and forming 3 steps are 60 mm in length × 80 mm in width × 80 mm in width.

  The specified weight of this crib is 155 ± 10 g.

  The crib whose water content was adjusted to 10% or less was ignited by a gas stove and burned for a predetermined time. The crib during burning was moved to the fire extinguishing test site, and a K-type thermocouple was installed in the crib during burning. After confirming that the thermocouple captured the heat of combustion, the prepared extinguishing fluid was supplied to the burning crib and extinguished.

  The fire extinguishing experiment recorded moving pictures and recorded the fire extinguishing condition, temperature change, and the amount of extinguishing fluid volume data before and after the fire extinguishing at this time.

  Evaluation of the fire extinguishing effect was performed based on the evaluation method (nonpatent literature 2-5) of Takahashi.

  According to Non Patent Literatures 3 and 4, the following equation holds.

Q ₀ = M ₀ φλ ₀ (1)
In equation (1), Q ₀ is the amount of water necessary for extinguishing, M ₀ is the initial weight of crib, φ is the crib weight loss rate, λ is the charcoal yield (0.29) with respect to the weight loss 1 at crib burning [mu] ₀ is the amount of water (3.4) required to extinguish the unit weight charcoal in the top water injection method.

  Also, "0" of the subscript is a coefficient and a calculated value given by Takahashi's experimental system.

  In addition, Non-Patent Document 5 presents the ability of the extinguishant of the following formula.

η = μ _meas / μ ₀ (2)
In equation (2), the subscript "meas" is the experimental result.

  In other words, it is possible to compare fire extinguishing effects by finding the value of 効果.

  Since μ is defined as the required amount of water specific to the method required for extinguishing, it can be compared including the effects of different extinguishing methods and different extinguishing agents. In this experiment, it is different from Takahashi's experimental method because fire extinguishing experiment is performed by spraying fire extinguishing fluid. Then, the operation constant in the case of the water which made the fire extinguisher the same was calculated | required, and the evaluation of the fire extinguishing liquid on the same spray speed conditions as this experimental system was performed as follows based on the operation constant.

In this experiment, when the weight loss rate of crib was 0.62, the amount of water used for extinguishing was 54 [g]. This measured value was about half of the value of Q ₀ calculated from Takahashi's experimental method.

Therefore, in order to obtain the operation constant of the present experimental system, water is used as a fire extinguishing agent at the same spray speed as the present experimental system in the same experimental environment of the same crib weight loss rate (here, shown as "wo" of subscript). the amount Q'w ₀ extinguishing water when used in sprayed, divided by the required extinguishing water Qw ₀ extinguishing water in the top water-filling Takahashi, expressed by the following equation when the .eta.1.

η1 = Q'w ₀ / Qw ₀
= Q'w ₀ / Mw ₀ φλw ₀ (3)
As a result of analysis based on the experimental results, η1 was determined to be 0.52.

By multiplying η 1 by the required extinction amount Q ₀ of the top water injection method, the amount Q _{cc of} fire extinguishing water required in this experimental system can be obtained.

Q _cc = 1 ₁ Q ₀ (4)
The fire extinguishing effect Ef is obtained by dividing the liquid amount used in this experimental system by Q _cc , and the fire extinguishing effect of the extinguishing liquid used in the experiment is shown as a multiple of the extinguishing effect of water.

Ef = Q _meas / Q _cc (5)
In equation (5), Q _meas is the amount of extinguishing fluid used in the experiment.

  Therefore, if the spray rate of the extinguishant to the burning crib is made constant, if using the experimental value of the required extinguishing amount and the equations (1), (3), (4) and (5), this experiment It is possible to evaluate the extinguishing ability of the prepared extinguishant when the extinguishing ability of water is 1 in the system.

  About the influence of the moisture content of coating formation, the prepared various samples were sprayed on the slide glass, and it injected | threw-in to the furnace previously heat-retained at 700 degreeC under air atmosphere with the electric furnace. After moving picture recording of the change of the fire extinguishing liquid by heating, it was taken out from the electric furnace and visually observed the formation state of a solid film or a bubble.

  For the thermal stability of coatings with different moisture content, the prepared samples were applied to glass slides and pre-dried to different moisture content. After placing each sample in an electric furnace, it was heated at a temperature rising rate of 20 ° C./min. In an air atmosphere, and photographed at every arbitrary temperature.

  About the influence of the deliquescence of the coating formations from which a moisture content differs, the prepared various samples are apply | coated to a glass slide, what was naturally dried is made into an absolute-drying state using an electric furnace. Thereafter, the time taken out of the electric furnace was taken as the start of the deliquescence experiment, and photography was performed at an arbitrary time until the deliquescence was in equilibrium.

  Here, the non-drying state refers to a state in which heat treatment is performed in an electric furnace by raising the temperature from room temperature to 600 ° C. at a rate of 20 ° C./min. In an air atmosphere for 4 hours at 600 ° C.

  The solid fraction was determined by dividing the solid content (absolute dry weight) in the as-dried state by the sampled amount (containing both solid and water) and multiplying by 100. The solid content may also be referred to as the solid content concentration.

  The water content was determined by subtracting the solid content from 100.

  With regard to deliquescence, measurement of time was started when it was taken out of the electric furnace, and photography was performed until the deliquescence was in equilibrium.

[Example 1] Characteristics of each extinguishing fluid: extinguishing by manual spray
The water of the comparative example fire extinguishing fluid used tap water.

Preparation Method of Example 1-1 10 g of potassium carbonate was dissolved in 46 g of water to prepare a sample 1-1 simulating a fortification solution of pH 12.11.

Preparation Method of Example 1-2
The same volume of water as that of the aqueous solution of JIS Standard No. 3 sodium silicate was mixed to prepare a sample 1-2 having a viscosity of 3.87 [mPas] and a solid content concentration of 18.6%.

Preparation Method of Example 1-3 30 g of potassium carbonate was dissolved in 231 g of water to obtain an aqueous solution having a pH of 11.99. The potassium carbonate aqueous solution of the same volume as JIS Standard No. 2 potassium silicate aqueous solution was mixed to prepare Sample 1-3 having a viscosity of 4.71 [mPas] and a solid content concentration of 20.2%.

Experimental Method Each sample was prepared as described above, and a thermocouple was placed on the crib burned for 3 minutes at the position of the triangle of crib shown in FIG. 1, and extinguished using a manual spray. The fire extinguishing experiment recorded moving pictures and recorded the fire extinguishing condition, temperature change, and the amount of extinguishing fluid volume data before and after the fire extinguishing.

Test Results Test results are shown in Table 1 and FIG.

  Table 1 shows the viscosity of the extinguishing liquid used in the extinguishing experiment, the amount of liquid used for extinguishing, the extinguishing effect, and the arrival time below 50 ° C. in Example 1.

  In FIG. 2, the time-dependent change of the thermal behavior of the experiment which extinguished each extinguishing fluid with the manual spray is shown.

  A comparative example is shown in FIG. In the comparative example, every time the flame of the burning crib sprayed, it took 14 minutes to escape and extinguish. Although the portion where water was attached to the crib by spraying was once extinguished, due to the influence of the heat around the burning, the reheating was repeated successively by evaporation of the water. After 12.5 minutes, crib began to collapse and after 14.5 minutes it completely collapsed. Firefighting was completed without recombustion when sprayed after the collapse.

  Example 1-1 is shown in FIG. When the sample 1-1 was sprayed, the first extinction occurred after 2 minutes, but as in the case of water, due to the influence of the heat around the burning, the water of the sample 1-1 reburned when it evaporated. After that, the fires and flares were repeated, and nine minutes later, crib's collapse started. However, the amount of extinguishing fluid used was smaller than in the case of water, and the extinguishing effect was also better than in the comparative example.

  In Example 1-1, it was found that the amount of the fire extinguishing agent used was smaller than that of the comparative example, so that the effect of the thermal decomposition of potassium carbonate appeared.

  Example 1-2 is shown in FIG. 2-3. When the sample 1-2 was sprayed, the first extinction was 5 minutes after the start of the extinguishment. When I left it for 2 minutes as it was, I burned again. The relapsed area was a relapse from the area where the sprayed sample 1-2 did not reach the flame. After 7.5 minutes, it was re-sprayed and extinguished. The temperature in the crib began to rise when left to stand again. Spraying was continued until the temperature dropped to extinguish fires that could not be seen.

  In Example 1-2, there was no collapse of crib. In Example 1-2, at the same time as the effect of the sample being coated on the burning material at the time of extinction and maintaining the temperature of crib, the asphyxiation effect also appeared.

  Example 1-3 is shown in FIG. When Samples 1-3 were sprayed, they were extinguished 3.5 minutes after the start of the extinguishment. In Example 1-3, the amount of the extinguishant used was the smallest. After 3.5 minutes, the temperature in the crib decreased relatively rapidly without relapse. In Examples 1-3, there was no crib collapse.

  In Examples 1-3, at the same time as the effect of coating the burning material at the time of extinguishment and maintaining the temperature of crib, the asphyxiation effect also appeared. Moreover, the best results were obtained by the effect of thermal decomposition of potassium carbonate. Thus, it has become clear that the fire extinguishing effect is enhanced by using the combination of the silicate compound and the metal carbonate component.

  It was found that when the silicate compound and the metal carbonate were mixed, the extinguishing effect was enhanced. The upper limit of the amount of metal carbonate added is the saturated dissolution amount of each carbonate. Therefore, in order to improve the ability to extinguish fires, the use of metal carbonates alone can not improve the fire extinguishing effect.

  In order to further improve the fire extinguishing effect, it is more effective to enhance the fire extinguishing effect of the silicate compound. This is because the fire extinguishing effect of metal carbonate can be further added to the fire extinguishing effect enhanced by the silicate compound. Therefore, in the subsequent experiments, enhancement development of the fire extinguishing effect derived from the silicic acid compound was conducted.

[Example 2] Solid film and formation of solid foam
Preparation methods of Examples 2-1 to 2-7
A fire extinguishing base agent (hereinafter referred to as "base agent") prepared by mixing 0.1 parts by weight of aluminum silicate with 100 parts by weight of solid content of JIS Standard No. 2 potassium silicate aqueous solution It diluted suitably with water and prepared each sample from which the viscosity shown in Table 2 differs.

Test Results Test results are shown in Table 2 and Photo 1 (FIG. 5). Table 2 shows a state in which each sample was sprayed on a slide glass and the slide glass was put into an electric furnace immediately after that in a wet state in Example 2, and the respective viscosity and solid fraction.

  Photo 1 shows the appearance of the sample taken after heating.

  The second embodiment is similar to the state in which the fire extinguishing agent is sprayed on the combustion material because the wet state is introduced to the heat source. Moreover, since the slide glass is used, it can be observed well in what state the temperature-sensitive inorganic composition extinguishant reacts with the high-temperature object.

  The appearance of the foaming state of the spray liquid supplied to the heat source is shown in the photograph 1 ("number-number" in the photograph 1 is the same as the sample "number-number"). Here, in Example 2-3 (third from the left in Photo 1), the slide glass was broken at the time of the experiment. With the increase of the viscosity of the extinguishing solution, the foaming bulk of the solid foam is increased and the solid film area is narrowed.

  On the other hand, as the viscosity of the extinguishing fluid decreases, the foaming bulk of the solid foam decreases, and the solid film area widens. Here, the solid film means a state in which the film formed on the slide glass is spread horizontally without being laminated.

  Considering the function of the present invention as a fire extinguishing fluid, the surface of the combusted material may be covered efficiently, and it is not necessary to be unnecessarily bulky. Therefore, if the volume of the extinguishing fluid is the same, if the viscosity is low, the covering area will be large, so the extinguishing efficiency is good.

  On the other hand, with regard to the fire extinguishing fluid having a high viscosity, it is not suitable for the spray type extinguishing fluid, considering that the handling of the sprayer becomes difficult. However, if the application is separated, by filling the pack with the high viscosity fire extinguishing liquid and installing it at the fire spread prediction point, it is possible to exert the heat shielding property utilizing the bulkiness which is the feature of high viscosity, and to suppress fire spread.

  As described above, it was revealed that controlling the solid content concentration of the silicate compound can control the state (the shape of a solid film or a solid foam or a composite) that changes due to the heat of fire.

[Example 3] High temperature stability of solid foam
Preparation Method of Example 3
Slide glass with a base material (solid content concentration at this time is 36.3%) prepared by mixing 25.8 parts by weight of aluminum silicate with 100 parts by weight of solid content of JIS standard 3 sodium silicate aqueous solution After application, the samples were prepared by adjusting the water content.

Test Results A photograph 2 (FIG. 6) shows the state of foaming of the spray liquid of the extinguishing liquid introduced into the heat source (Example 3). In Example 3, the water content of the extinguishing solution was adjusted in advance and the film was formed on the slide glass before the sample was put into the electric furnace. Sample 3-1 (left side) has a moisture content of 40%, and sample 3-2 (right side) has a water content of 7%. Heat was applied to both samples and when it exceeded 100 ° C. foam began to form with evaporation of water, becoming a solid foam.

  After foaming was initiated, the solid foam maintained its bulk almost up to 750 ° C. When the temperature exceeds 750 ° C., the bulk gradually decreases, but the shape of the bubble is maintained. Moreover, since it exceeds the softening point of glass when it exceeds 750 degreeC, a solid bubble softens gradually. However, it was confirmed that the glass did not melt and deteriorate at least up to 850 ° C., and there was no flow of solid bubbles and strongly adhered to the slide glass.

  The state of this heating change is schematically showing how the heat flow of the solid foam follows the heat of the fire immediately after the fire extinguishing liquid is supplied to the combustion material at the time of fire. Thus, unlike the liquid foam, the present fire extinguishing agent exhibits very high heat resistance.

  In addition, since the fire extinguishing agent is strongly adhered to the adhered object until it melts and flows out, the asphyxiation effect can be sustained and exhibited up to a very high temperature, and it is clear that it has a fire spread suppressing effect. became. In addition, it was found that there is also an effect in preventing reburning in the afterglow treatment in forest and field fires.

[Example 4] Solid film and deliquescence of solid foam
Preparation Method of Example 4
A base material was prepared by mixing 3.5 parts by weight of aluminum silicate with 100 parts by weight of the solid content of the JIS Standard No. 1 potassium silicate aqueous solution.

  The base material was adjusted to a viscosity of 12.0, 6.03 and 2.27 [mPas] by dilution with water, and after applying approximately the same amount on a slide glass, it was predried.

  Thereafter, the samples were heated in an air atmosphere at 600 ° C. for 4 hours to prepare each sample in an absolute dry state.

Test results The time course of each sample of Examples 4-1 to 4-3 is shown at the start of the experiment immediately after taking out from the heat source of 600 ° C. in the photograph 3 (FIG. 7). The experimental day was an experimental environment with an average temperature of 23.6 ° C and an average humidity of 82%.

  As the condition at the start of the experiment, the solid foam only in the left side (Sample 4-1), the mixture of solid foam and solid film in the middle (Sample 4-2), and the solid film only in the right side (Sample 4-3). It was in the condition of It deliquesed in all samples over time and changed from solid to liquid.

  The state of the solid foam of Example 4-1 is the slowest to liquefy, and it takes about 3.5 hours. The liquefaction of the solid film is difficult to judge because there is no color change, but the time to liquefaction is shorter than that of the laminated solid foam. The time required for the deliquescence is shown in Photo 3 to be different depending on the bulkiness and the foam density of the foam bulk layer.

  In addition, since the experiment was started in the dry state, it absorbed moisture from atmospheric moisture (having the meaning of starting from the dry silicate layer without water in each sample) to make it liquid It indicates that the deliquescence phenomenon that has occurred is shown, and that the water contained in the coating in advance does not affect the deliquescence phenomenon.

  In Examples 5 and 6 to be described later, part of deliquescence was observed, and part of deliquescence was also observed in the mixture with the sodium silicate compound. From this fact, it was found that the deliquescence phenomenon that occurs after forming the silicate layer can be controlled by adjusting the composition of the extinguishant.

[Example 5] Performance of fire extinguishing fluid: Influence of viscosity
Preparation Method of Example 5
Aluminum silicate of 3.5 parts by weight with respect to 100 parts by weight (volume ratio 1: 3) obtained by totaling solid contents of JIS Standard No. 1 potassium silicate aqueous solution and solid contents of JIS Standard No. 2 potassium silicate aqueous solution Was mixed to prepare a matrix. Each sample was prepared by diluting the matrix with water to adjust the viscosity to 11.4, 6.24 and 2.08 [mPas].

Test Results Table 3 shows the viscosity of the extinguishant used in the extinguishing experiment, the amount of extinguished liquid, the extinguishing effect, and the time taken for the temperature of the crib to fall below 50 ° C. With the same composition as the extinguishing fluid, the sprayable viscosity decreased and the amount of the extinguishing fluid used decreased, and the extinguishing effect increased.

  This is because the effect of the area covered with the combustion product with a solid film effective for fire extinguishing and the effect of rapidly lowering the temperature of the substance to be extinguished by using the heat of vaporization of water were developed.

  The time-dependent change of the temperature inside the crib of the extinction experiment of Example 5-1 (in the case of the viscosity of 11.4 [mPas]) in FIG. 3-1 is shown.

  In Sample 5-1, the fire extinguishing liquid was sprayed for 2 seconds into the burning crib for 102 seconds after the start of measurement, and the temperature in the crib decreased rapidly. After confirmation of extinction, the fire extinguishing fluid was sprayed for 1 second in 127 seconds from the start, and the spraying was stopped.

  After the spray was stopped, the temperature inside the crib once approached the burning temperature of the wood 260 ° C, but then the temperature gradually dropped. The phenomenon that the temperature in the crib rises after the spray is stopped is because the foam layer inhibits the heat dissipation of the crib.

  As described above, since the temperature in the object to be coated is maintained by the foaming, it has become clear that there is also an anti-temperature change effect on external heat. In Sample 5-1 (viscosity 11.4 [mPas]) which can be sprayed, since the thickness of the foam layer is properly controlled, it does not reach the combustion temperature of wood, it can dissipate heat relatively gently, and good results are shown Indicated.

  The time-dependent change of the temperature inside the crib of the extinction experiment of Example 5-2 (in the case of a viscosity of 6.24 [mPas]) is shown in FIG.

  The sample 5-2 was extinguished by spraying a fire extinguishing fluid on the burning crib for 1 second 84 seconds after the start of measurement, and the temperature in the crib dropped immediately. After confirmation of the extinction, the fire extinguishing fluid was sprayed four times against the flame for about 1 second at any time from the start to 227 seconds, and the spraying was stopped.

  After the cessation of spraying, foaming of the extinguishing solution was not observed so much, and the temperature in the crib decreased relatively quickly. The temperature in the crib decreases relatively quickly after the spray is stopped because the heat in the crib escapes out of the crib more efficiently than in Example 5-1 because it is a composite of a solid film and a solid foam. .

  The coating of the mixture of the solid foam and the solid film on the combustion product in this way showed a good result of extinguishing the fire.

  The time-dependent change of the temperature inside the crib of the extinction experiment of Example 5-3 (in the case of the viscosity of 2.08 [mPas]) is shown in FIG. 3-3.

  In Sample 5-3, when the fire extinguishing solution was sprayed onto the burning crib for 1 second in 61 seconds from the start of measurement, the flame was extinguished, and the temperature in the crib rapidly decreased. After confirmation of the extinction, the fire extinguishing fluid was sprayed four times against the flame for about 1 second at any time from the start to 153 seconds, and the spraying was stopped.

  After the spray stopped, no foaming of the extinguishing fluid was observed, and the temperature in the crib decreased rapidly. The reason why the temperature in the crib decreases rapidly after the spray is stopped is that the heat in the crib is dissipated out of the crib more efficiently than in Example 5-1 and Example 5-2 because a solid film is formed. is there.

  In this way, the solid film coated the combustion product, which extinguished well, and the temperature drop of crib after extinguishing was also the fastest.

[Example 6] Performance of fire extinguishing fluid: Concentration of aluminum silicate
Preparation methods of Example 6-1, Example 6-2 and Example 6-3
0.1 parts by weight of aluminum silicate per 100 parts by weight (volume ratio 1: 3) of the solid content of JIS standard 1 aqueous solution of potassium silicate and the solid content of potassium aqueous solution according to JIS standard 2 (1: 3) Were mixed to prepare a matrix of Example 6-1.

  1.0 part by weight of aluminum silicate per 100 parts by weight (volume ratio 1: 3) of the solid content of JIS Standard 1 aqueous solution of potassium silicate and the solid content of JIS aqueous solution 2 of JIS standard 2 Were mixed to prepare a matrix of Example 6-2.

  Aluminum silicate of 3.5 parts by weight with respect to 100 parts by weight (volume ratio 1: 3) obtained by totaling solid contents of JIS Standard No. 1 potassium silicate aqueous solution and solid contents of JIS Standard No. 2 potassium silicate aqueous solution Were mixed to prepare a matrix of Example 6-3.

  Each sample was diluted with water and adjusted to a viscosity of about 2.10 [mPas] to prepare each sample. Example 6-3 is the same as Example 5-3.

Test results Table 4 shows the amount of the extinguishant used in the extinguishing experiment and the extinguishing effect. Here, the sample 6-3 is the same as the sample 5-3 in Table 3. At the same viscosity, as the concentration of aluminum silicate increased, the amount of extinguishant used decreased and the extinguishing effect increased.

  Also, the time during which the temperature in the crib falls below 50 ° C. becomes shorter as the amount of aluminum silicate increases. This is because the coating effect on the combustion material, the vaporization heat cooling of the water, and the high temperature stability of the film made of aluminum silicate are developed.

  Fig. 4-1 shows the time-dependent change of the temperature inside the crib of the fire extinguishing experiment in the case of the viscosity 2.18 [mPas] of the sample 6-1. When the fire extinguishing solution was sprayed for 3 seconds to the burning crib for 76 seconds after the measurement start, the flame was extinguished and the temperature in the crib decreased immediately. After confirmation of the extinction, the fire extinguishing fluid was sprayed twice against the flame for about 1 second at any time from the start to 129 seconds, and the spraying was stopped.

  After the spray stopped, no foaming of the extinguishing fluid was observed, and the temperature in the crib decreased. Here, the measured temperature at the bottom is following a gentle drop. This is not the entire surface of the flame on the bottom of the crib, but the state where the extinguishing fluid is applied around the flame on the bottom of the crib. In other words, because a solid film with a suffocating effect surrounds the bonfire, oxygen is hardly supplied to the bonfire and it naturally quenches. However, looking at Fig. 4-1, the temperature drop of the entire crib below 50 ° C is hardly affected.

  It was also found that it is possible to create a state where it is easy to suppress the natural fire by surrounding the open flame with a solid film in this way. In addition, by covering the solid film with the burning matter, the fire extinguished well, and the temperature decrease after the fire extinguishment was also quick.

  FIG. 4-2 shows a time-dependent change in temperature inside the crib of the fire extinguishing experiment in the case of the viscosity of 2.07 [mPas] of Sample 6-2. When the fire extinguishing solution was sprayed on the burning crib for 2 seconds 75 seconds after the start of the measurement, the flame was extinguished and the temperature in the crib decreased immediately. After confirmation of the extinction, the fire extinguishing fluid was sprayed three times against the flame for about 1 second at any time from the start to 192 seconds, and the spraying was stopped.

  After the spray stopped, no foaming of the extinguishing fluid was observed, and the temperature in the crib decreased rapidly. The reason why the temperature in the crib decreases rapidly after the spraying is stopped is that a solid film is formed.

  By covering the solid matter with the combusted matter in this way, the fire extinguished well, and the temperature decrease after the fire extinguishment was also quick.

  Sample 6-3 is the same as sample 5-3, and the experimental results are also the same as FIG. 3-3.

  As compared with Samples 6-1 and 6-2, it can be seen that the variation of each measured temperature is small, and the temperature of the crib is rapidly lowered.

  Thus, it has been found that the fire extinguishing effect is enhanced as the concentration of aluminum silicate is increased.

Claims (8)

A temperature sensitive inorganic composition fire extinguisher comprising: an alkali metal silicate compound; and 0.1 to 26 parts by weight of aluminum silicate and water with respect to 100 parts by weight of the solid content of silicon dioxide of the alkali metal silicate compound. Alkali metal silicate compound, 0.1 to 26 parts by weight of aluminum silicate per 100 parts by weight of solid content of silicon dioxide of the alkali metal silicate compound, and metal carbonate having a saturation concentration or less with respect to water at 30 ° C. Temperature-sensitive inorganic composition extinguishant containing water.   The thermosensitive inorganic composition fire extinguisher according to claim 1 or 2, wherein the alkali metal silicate is at least one compound selected from the group consisting of sodium silicate, potassium silicate and lithium silicate. The temperature-sensitive property according to claim 2 , wherein the metal carbonate is an alkali metal carbonate and an alkali metal hydrogen carbonate, and the alkali metal is at least one compound selected from the group consisting of sodium, potassium and lithium. Inorganic composition fire extinguisher. A temperature-sensitive inorganic composition as claimed in Claim 1 comprising an alkali metal silicate compound and 0.1 to 26 parts by weight of aluminum silicate per 100 parts by weight of the solid content of silicon dioxide of the alkali metal silicate compound, and water. Alkali metal silicate compound, 0.1 to 26 parts by weight of aluminum silicate per 100 parts by weight of solid content of silicon dioxide of the alkali metal silicate compound, and metal carbonate having a saturation concentration or less with respect to water at 30 ° C. Temperature-sensitive inorganic composition fire retardant containing water.   The temperature-sensitive inorganic composition as claimed in claim 5 or 6, wherein the alkali metal silicate compound is at least one compound selected from the group consisting of sodium silicate, potassium silicate and lithium silicate. 7. The thermosensitive material according to claim 6 , wherein the metal carbonate is an alkali metal carbonate and an alkali metal hydrogen carbonate, and the alkali metal is at least one compound selected from the group consisting of sodium, potassium and lithium. Inorganic composition fire retardant.