Gas-producing composition for extinguishing fires and process for producing this composition
Abstract
The pyrotechnic, aerosol-forming composition (I) for extinguishing fires in closed rooms, contains: (A) 67-72 wt.% potassium nitrate with an average particle diameter (PD) of not more than 25 mu m; (B) 8-12 wt.% phenol-formaldehyde (PF) resin with a PD of not more than 100 mu m; and (C) dicyandiamide as the remainder with a PD of not more than 15 mu m. Also claimed is the production of (I).

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4 claims: 4 independent, 0 dependent
- 1Pyrotechnic, aerosol-forming composition for extinguishing fires in closed rooms, containing potassium nitrate in an amount of 67-72 mass%, phenol formaldehyde resin in an amount of 8-12 mass%, and dicyandiamide as the rest, characterized in that the particles of potassium nitrate have an average diameter of not more than 25 µm, those of the phenol formaldehyde resin have an average diameter of not more than 100 μm and those of the dicyandiamide have an average diameter of not more than 15 μm. Pyrotechnische, aerosolbildende Zusammensetzung zum Löschen von Bränden in geschlossenen Räumen, enthaltend Kaliumnitrat in einer Menge von 67-72 Masse-%, Phenolformaldehydharz in einer Menge von 8-12 Masse-%, und Dicyandiamid als Rest, dadurch gekennzeichnet, daß die Teilchen des Kaliumnitrats einen mittleren Durchmesser von nicht größer als 25 µm besitzen, die des Phenolformaldehydharzes einen mittleren Durchmesser von nicht größer als 100 µm und die des Dicyandiamids einen mittleren Durchmesser von nicht größer als 15 µm besitzen.
- 2Pyrotechnic, aerosol-forming composition according to claim 1, characterized in that it additionally contains potassium bicarbonate, potassium benzoate or potassium hexacyanoferrate in an amount of 4-12% by mass and with an average particle diameter of not greater than 15 µm. Pyrotechnische, aerosolbildende Zusammensetzung nach Anspruch 1, dadurch gekennzeichnet, daß sie zusätzlich Kaliumbicarbonat, Kaliumbenzoat oder Kaliumhexacyanoferrat in einer Menge von 4-12 Masse-% und mit einem mittleren Teilchendurchmesser von nicht größer als 15 µm enthält.
- 3Process for the preparation of an aerosol-forming composition for extinguishing fires according to one of Claims 1 or 2, characterized in that a solution of the phenol formaldehyde resin in a mixture of ethyl alcohol with acetone in a ratio of 30-50:70-50 is prepared, the powdered constituents are mixed with the phenol-formaldehyde resin solution with addition of the solution in portions until a uniform distribution of the constituents is obtained in the mass of the composition and the granulation of the mixture simultaneously with drying at a temperature of 20-70 ° C. to a content of moisture and volatile components of not more than 1%. Verfahren zur Herstellung einer aerosolbildenden Zusammensetzung zum Löschen von Bränden nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß man eine Lösung des Phenolformaldehydharzes in einer Mischung von Ethylalkohol mit Aceton im Verhältnis 30-50:70-50 herstellt, die pulverförmigen Bestandteile mit der Phenolformaldehyharzlösung vermischt unter portionsweiser Zugabe der Lösung bis zum Erhalt einer gleichmäßigen Verteilung der Bestandteile in der Masse der Zusammensetzung und die Granulierung der Mischung gleichzeitig mit der Trocknung bei einer Temperatur von 20-70°C bis zu einem Gehalt an Feuchtigkeit und flüchtigen Bestandteilen von nicht mehr als 1% durchführt.
- 4Process for the preparation of an aerosol-forming composition for extinguishing fires according to one of Claims 1 or 2, characterized in that a solution of the phenolformaldehyde resin in a mixture of ethyl alcohol with acetone in a ratio of 30-50:70-50 is prepared, in portions and to this solution with constant stirring there is an aqueous potassium nitrate solution in an amount that the volume ratio of aqueous potassium nitrate solution to phenol formaldehyde resin solution in the mixture obtained is 40-60: 60-40, the powdered constituents in portions and with constant stirring in the resulting mixture until the constituents are uniformly distributed in the mass of the composition and the granulation of the mixture is carried out simultaneously with drying at a temperature of 20-70 ° C. to a moisture content and volatile components of not more than 1%. Verfahren zur Herstellung einer aerosolbildenden Zusammensetzung zum Löschen von Bränden nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß man eine Lösung des Phenolformaldehydharzes in einer Mischung von Ethylalkohol mit Aceton im Verhältnis 30-50:70-50 herstellt, zu dieser Lösung portionsweise und unter ständigem Rühren eine wäßrige Kaliumnitratlösung in einer Menge gibt, daß in der erhaltenen Mischung das Volumenverhältnis von wäßriger Kaliumnitratlösung zu Phenolformaldehydharzlösung 40-60:60-40 beträgt, die pulverförmigen Bestandteile portionsweise und unter ständigem Rühren in die erhaltene Mischung gibt bis zum Erhalt einer gleichmäßigen Verteilung der Bestandteile in der Masse der Zusammensetzung und die Granulierung der Mischung gleichzeitig mit der Trocknung bei einer Temperatur von 20-70°C bis zu einem Gehalt an Feuchtigkeit und flüchtigen Bestandteilen von nicht mehr als 1% durchführt.
Independent claims4
22 paragraphs, as filed
The invention relates to fire extinguishing technology, in particular the prevention and extinguishing of fires in closed rooms.
To extinguish a fire in a closed room, it is known to create an atmosphere in this room which prevents combustion. Inert diluents are used as fire extinguishing agents (carbon dioxide, nitrogen, argon, water vapor), volatile inhibitors, in particular halogen-containing agents, fire extinguishing powders (AN Baratov, EM Ivanov, "Extinguishing Fires in the Chemical and Petroleum Processing Industry", Moscow, Chemistry, 1979 ).
The known methods of extinguishing fire in rooms with inert diluents cannot be used to extinguish alkali and alkaline earth metals, some metal hydrides and compounds that contain oxygen in their molecules.
When developing systems for extinguishing in rooms, there are limited possibilities due to the size of the buildings to be protected (with very large sizes of the buildings, it is very difficult to provide a sufficient amount of gas in a certain time). In addition, one must consider a possible danger to people present from suffocation (signaling systems are therefore necessary which indicate the use of the extinguishing process).
Deleting with halogen-containing compounds also has a number of disadvantages. These compositions can have a toxic effect on humans, since the halogen-containing compounds form thermal decomposition products of great corrosion activity when extinguished by fire. In addition, rooms that are particularly at risk of fire are usually protected with very large fire extinguishing systems for room fire extinguishing, in which halogenated hydrocarbons are used. Due to the international measures to protect the ozone layer in accordance with the Montreal Protocol (1987), the use of the fluorocarbons mentioned must be halved by 1995 and completely abandoned by 2000, as these substances have a high ozone-depleting potential.
Systems for extinguishing fire in rooms in which halogen-containing hydrocarbons are used are known (for example GB-PS 2 020 971). A disadvantage of such systems is their harmful effect on the environment. In addition, such systems are fairly large in size and fairly heavy so that their effectiveness in extinguishing fires in vehicles, such as airplanes, is compromised.
A method for producing a fire extinguishing agent is known in which a mixture of solid particles and inert gases forms when a charge of a pyrotechnic composition is burned off (WO 92/17244). However, the high temperature of the combustion products leads to an increase in the average room temperature in the room, which leads to harmful effects on living beings. In addition, when pyrotechnic solid fuels are burned, gaseous products (CO, NH<sub>3</sub>, H<sub>2</sub>, CH<sub>x</sub> and NO<sub>x</sub>) the incomplete combustion of the organic components, which leads to pollution of the environment by these products.
The composition according to the invention solves the task of providing an ecologically harmless composition for extinguishing fire in rooms.
An object of the invention is a pyrotechnic, aerosol-forming composition for extinguishing fires in closed rooms, containing potassium nitrate in an amount of 67-72 mass%, phenol formaldehyde resin in an amount of 8-12 mass%, and dicyandiamide as the remainder, the Particles of potassium nitrate have an average particle diameter of not more than 25 μm and, accordingly, a specific surface area of not less than 1500 cm<sup>2</sup>/ g, and the average particle diameter of the phenol formaldehyde resin is not larger than 100 µm, and that of the dicyandiamide is not larger than 15 µm.
The composition according to the invention preferably additionally contains potassium bicarbonate (KHCO<sub>3</sub>), Potassium benzoate (C<sub>7</sub>H<sub>5</sub>O<sub>2</sub>K) or potassium hexacyanoferrate K<sub>3</sub>[(FeCN)<sub>6</sub>] with an average particle diameter of the potassium-containing substance of no greater than 15 µm and, accordingly, a specific particle surface area of no less than 500 cm<sup>2</sup>/G.
This composition contains (in% by mass): <tables id="tabl0001" num="0001"><table frame="all"><tgroup cols="2" colsep="1" rowsep="0"><colspec colnum="1" colname="col1" colwidth="78.75mm" /><colspec colnum="2" colname="col2" colwidth="78.75mm" /><tbody valign="top"><row><entry namest="col1" nameend="col1" align="left">Potassium nitrate</entry><entry namest="col2" nameend="col2" align="right">67-72</entry></row><row><entry namest="col1" nameend="col1" align="left">Dicyandiamide</entry><entry namest="col2" nameend="col2" align="right">9-16</entry></row><row><entry namest="col1" nameend="col1" align="left">Phenol formaldehyde resin</entry><entry namest="col2" nameend="col2" align="right">8-12</entry></row><row rowsep="1"><entry namest="col1" nameend="col1" align="left">Potassium benzoate, bicarbonate or hexacyanoferrate</entry><entry namest="col2" nameend="col2" align="right">4-12</entry></row></tbody></tgroup></table></tables>
The object is also achieved by the process for the preparation of the composition according to the invention, which comprises providing a solution of the phenol formaldehyde resin, mixing the constituents, sieving, granulating and drying, a mixture of ethyl alcohol being used to prepare the solution of the phenol formaldehyde resin Acetone used in the ratio 30-50: 70-50, the pulverulent constituents are mixed with the solution of the phenol formaldehyde resin by adding the solution in at least two equal portions until the constituents are evenly distributed over the entire mass, ie until a uniform and stable mass is obtained, the mixture is granulated simultaneously with its drying at temperatures of 20-70 ° C. until a residual moisture and volatile content of not more than 1% and sufficient flowability of the granulated composition when used is reached.
The ratio and dispersity of the constituents as well as the process for producing the composition ensure faster and more complete combustion of the composition and a larger amount of highly disperse particles and inert gases (CO<sub>2</sub>, N<sub>2</sub>, and H<sub>2</sub>O as vapor) in the aerosol, which in turn ensures the extinguishing performance of the composition and enables a tolerable toxic level to humans when extinguishing fire.
The use of highly dispersed starting products of the powder-forming components (potassium nitrate, dicyandiamide, potassium benzoate, potassium bicarbonate, Potassium hexacyanoferrate) and that of the phenol formaldehyde resin as a lacquer solution in ethyl alcohol / acetone mixture as well as the process according to the invention for the preparation of the composition make it possible to obtain a finished mixture with the necessary technological and consumption properties and to reduce the production time and the dangerousness of the production (there is a need for dangerous operations how to prevent circulation).
The composition according to the invention can be produced in standard pyrotechnic plants.
Table 1 shows formulations of the composition according to the invention in comparison with a known composition and the most important parameters of these compositions. It can be seen from Table 1 that the composition according to the invention exceeds the known one in all of the parameters mentioned.
Table 2 shows formulations of the composition according to the invention (Nos. 11, 14, 16, 17, 18 and 21) in comparison to compositions in which the amount and / or the dispersity of the constituents lie outside the range according to the invention. From Table 2 it can be seen that the composition according to the invention has a reduced toxic effect. A lower concentration of extinguishing agent is also required to extinguish the fire. Furthermore, the composition according to the invention ensures a larger amount of highly disperse particles and inert gases in the aerosol.<tables id="tabl0002" num="0002"><img file="EP0804946A1_D0001.tif" /></tables><tables id="tabl0003" num="0003"><table frame="all"><title>Table 2</title><tgroup cols="8" colsep="1" rowsep="1"><colspec colnum="1" colname="col1" colwidth="19.68mm" /><colspec colnum="2" colname="col2" colwidth="19.68mm" /><colspec colnum="3" colname="col3" colwidth="19.68mm" /><colspec colnum="4" colname="col4" colwidth="19.68mm" /><colspec colnum="5" colname="col5" colwidth="19.68mm" /><colspec colnum="6" colname="col6" colwidth="19.68mm" /><colspec colnum="7" colname="col7" colwidth="19.68mm" /><colspec colnum="8" colname="col8" colwidth="19.68mm" /><thead valign="top"><row><entry namest="col1" nameend="col1" rowsep="0" align="center">No.</entry><entry namest="col2" nameend="col4" align="center">Component content,% by mass, (average particle diameter, µm)</entry><entry namest="col5" nameend="col6" align="center">Toxic effects *</entry><entry namest="col7" nameend="col7" rowsep="0" align="center">Fire extinguishing concentration g / m<sup>3</sup></entry><entry namest="col8" nameend="col8" rowsep="0" align="center">Degree of discharge into the aerosol,%</entry></row><row rowsep="1"><entry namest="col1" nameend="col1" /><entry namest="col2" nameend="col2" align="left">KNO<sub>3</sub></entry><entry namest="col3" nameend="col3" align="center">Phenol formaldehyde resin</entry><entry namest="col4" nameend="col4" align="center">Gas aerosol formers</entry><entry namest="col5" nameend="col5" align="center">Death, %</entry><entry namest="col6" nameend="col6" align="center">Paralysis,%</entry><entry namest="col7" nameend="col7" /><entry namest="col8" nameend="col8" /></row></thead><tbody valign="top"><row><entry namest="col1" nameend="col1" align="left">1</entry><entry namest="col2" nameend="col2" align="char" char=",">60 (∼320)</entry><entry namest="col3" nameend="col3" align="left">15 (∼360)</entry><entry namest="col4" nameend="col4" align="left">25th (∼340) DCDA **</entry><entry namest="col5" nameend="col5" align="left">79</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">48</entry><entry namest="col8" nameend="col8" align="char" char=",">76</entry></row><row><entry namest="col1" nameend="col1" align="left">2</entry><entry namest="col2" nameend="col2" align="char" char=",">67 (<25)</entry><entry namest="col3" nameend="col3" align="left">10 (<100)</entry><entry namest="col4" nameend="col4" align="left">23 (∼340) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">4,2</entry><entry namest="col7" nameend="col7" align="left">36</entry><entry namest="col8" nameend="col8" align="char" char=",">88</entry></row><row><entry namest="col1" nameend="col1" align="left">3</entry><entry namest="col2" nameend="col2" align="char" char=",">60 (<25)</entry><entry namest="col3" nameend="col3" align="left">8 (∼360)</entry><entry namest="col4" nameend="col4" align="left">32 (∼340) DCDA</entry><entry namest="col5" nameend="col5" align="left">100</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">42</entry><entry namest="col8" nameend="col8" align="char" char=",">80</entry></row><row><entry namest="col1" nameend="col1" align="left">4</entry><entry namest="col2" nameend="col2" align="char" char=",">67 (<25)</entry><entry namest="col3" nameend="col3" align="left">18 (<100)</entry><entry namest="col4" nameend="col4" align="left">15 (∼340) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">58,3</entry><entry namest="col7" nameend="col7" align="left">38</entry><entry namest="col8" nameend="col8" align="char" char=",">84</entry></row><row><entry namest="col1" nameend="col1" align="left">5</entry><entry namest="col2" nameend="col2" align="char" char=",">60 (<25)</entry><entry namest="col3" nameend="col3" align="left">8 (<100)</entry><entry namest="col4" nameend="col4" align="left">32 (∼340) DCDA</entry><entry namest="col5" nameend="col5" align="left">100</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">40</entry><entry namest="col8" nameend="col8" align="char" char=",">84</entry></row><row><entry namest="col1" nameend="col1" align="left">6</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">5 (∼360)</entry><entry namest="col4" nameend="col4" align="left">25th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">12,5</entry><entry namest="col7" nameend="col7" align="left">36</entry><entry namest="col8" nameend="col8" align="char" char=",">86</entry></row><row><entry namest="col1" nameend="col1" align="left">7</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">15 (<100)</entry><entry namest="col4" nameend="col4" align="left">15 (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">4,2</entry><entry namest="col7" nameend="col7" align="left">34</entry><entry namest="col8" nameend="col8" align="char" char=",">90</entry></row><row><entry namest="col1" nameend="col1" align="left">8</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">18 (<100)</entry><entry namest="col4" nameend="col4" align="left">12th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">16,7</entry><entry namest="col7" nameend="col7" align="left">36</entry><entry namest="col8" nameend="col8" align="char" char=",">90</entry></row><row><entry namest="col1" nameend="col1" align="left">9</entry><entry namest="col2" nameend="col2" align="char" char=",">60 (<25)</entry><entry namest="col3" nameend="col3" align="left">15 (<100)</entry><entry namest="col4" nameend="col4" align="left">25th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">79</entry><entry namest="col6" nameend="col6" align="left">79,2</entry><entry namest="col7" nameend="col7" align="left">42</entry><entry namest="col8" nameend="col8" align="char" char=",">80</entry></row><row><entry namest="col1" nameend="col1" align="left">10</entry><entry namest="col2" nameend="col2" align="char" char=",">58 (<25)</entry><entry namest="col3" nameend="col3" align="left">5,5(<100)</entry><entry namest="col4" nameend="col4" align="left">36.5 (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">79</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">56</entry><entry namest="col8" nameend="col8" align="char" char=",">78</entry></row><row><entry namest="col1" nameend="col1" align="left">11</entry><entry namest="col2" nameend="col2" align="char" char=",">69 (<25)</entry><entry namest="col3" nameend="col3" align="left">12 (<100)</entry><entry namest="col4" nameend="col4" align="left">17th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">4,2</entry><entry namest="col7" nameend="col7" align="left">26</entry><entry namest="col8" nameend="col8" align="char" char=",">97</entry></row><row><entry namest="col1" nameend="col1" align="left">12</entry><entry namest="col2" nameend="col2" align="char" char=",">65,5(<25)</entry><entry namest="col3" nameend="col3" align="left">14 (<100)</entry><entry namest="col4" nameend="col4" align="left">20.5 (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">17,4</entry><entry namest="col7" nameend="col7" align="left">28</entry><entry namest="col8" nameend="col8" align="char" char=",">95</entry></row><row><entry namest="col1" nameend="col1" align="left">13</entry><entry namest="col2" nameend="col2" align="char" char=",">68 (<25)</entry><entry namest="col3" nameend="col3" align="left">13 (<100)</entry><entry namest="col4" nameend="col4" align="left">19th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">4,2</entry><entry namest="col7" nameend="col7" align="left">26</entry><entry namest="col8" nameend="col8" align="char" char=",">96</entry></row><row><entry namest="col1" nameend="col1" align="left">14</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">11 (<100)</entry><entry namest="col4" nameend="col4" align="left">19th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">0</entry><entry namest="col7" nameend="col7" align="left">24</entry><entry namest="col8" nameend="col8" align="char" char=",">99,3</entry></row><row><entry namest="col1" nameend="col1" align="left">15</entry><entry namest="col2" nameend="col2" align="char" char=",">54 (<25)</entry><entry namest="col3" nameend="col3" align="left">12 (<100)</entry><entry namest="col4" nameend="col4" align="left">34 (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">100</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">120</entry><entry namest="col8" nameend="col8" align="char" char=",">68</entry></row><row><entry namest="col1" nameend="col1" align="left">16</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">11 (<100)</entry><entry namest="col4" nameend="col4" align="left">12% (<15) DCDA + 7% (<15) KB</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">0</entry><entry namest="col7" nameend="col7" align="left">27</entry><entry namest="col8" nameend="col8" align="char" char=",">97</entry></row><row><entry namest="col1" nameend="col1" align="left">17</entry><entry namest="col2" nameend="col2" align="char" char=",">70 (<25)</entry><entry namest="col3" nameend="col3" align="left">10 (<100)</entry><entry namest="col4" nameend="col4" align="left">10% (<15) DCDA + 10% (<15) KBC</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">0</entry><entry namest="col7" nameend="col7" align="left">22</entry><entry namest="col8" nameend="col8" align="char" char=",">99</entry></row><row><entry namest="col1" nameend="col1" align="left">18</entry><entry namest="col2" nameend="col2" align="char" char=",">69 (<25)</entry><entry namest="col3" nameend="col3" align="left">8 (<100)</entry><entry namest="col4" nameend="col4" align="left">11% (<15) DCDA 12% (<15) KHCF</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">0</entry><entry namest="col7" nameend="col7" align="left">23</entry><entry namest="col8" nameend="col8" align="char" char=",">98</entry></row><row><entry namest="col1" nameend="col1" align="left">19</entry><entry namest="col2" nameend="col2" align="char" char=",">75 (<25)</entry><entry namest="col3" nameend="col3" align="left">10 (<100)</entry><entry namest="col4" nameend="col4" align="left">15% (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">12,5</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">40</entry><entry namest="col8" nameend="col8" align="char" char=",">90</entry></row><row><entry namest="col1" nameend="col1" align="left">20</entry><entry namest="col2" nameend="col2" align="char" char=",">76 (<25)</entry><entry namest="col3" nameend="col3" align="left">15 (<100)</entry><entry namest="col4" nameend="col4" align="left">9% (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">14,7</entry><entry namest="col6" nameend="col6" align="left">100</entry><entry namest="col7" nameend="col7" align="left">44</entry><entry namest="col8" nameend="col8" align="char" char=",">85</entry></row><row rowsep="1"><entry namest="col1" nameend="col1" align="left">21</entry><entry namest="col2" nameend="col2" align="char" char=",">72 (<25)</entry><entry namest="col3" nameend="col3" align="left">10 (<100)</entry><entry namest="col4" nameend="col4" align="left">18th (<15) DCDA</entry><entry namest="col5" nameend="col5" align="left">0</entry><entry namest="col6" nameend="col6" align="left">0</entry><entry namest="col7" nameend="col7" align="left">26</entry><entry namest="col8" nameend="col8" align="char" char=",">97</entry></row></tbody></tgroup><tgroup cols="8" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="19.68mm" /><colspec colnum="2" colname="col2" colwidth="19.68mm" /><colspec colnum="3" colname="col3" colwidth="19.68mm" /><colspec colnum="4" colname="col4" colwidth="19.68mm" /><colspec colnum="5" colname="col5" colwidth="19.68mm" /><colspec colnum="6" colname="col6" colwidth="19.68mm" /><colspec colnum="7" colname="col7" colwidth="19.68mm" /><colspec colnum="8" colname="col8" colwidth="19.68mm" /><tbody valign="top"><row><entry namest="col1" nameend="col8" align="justify">*) The results result from studies on white mice, which over 15 minutes a concentration of 60 g / m<sup>3</sup> were exposed and then checked for 2 weeks.</entry></row><row><entry namest="col1" nameend="col8" align="justify">**) DCDA - dicyandiamide KB - potassium benzoate KBC - potassium bicarbonate KHCF - potassium hexacyanoferrate</entry></row></tbody></tgroup></table></tables>
<b>example 1</b>
Very good results when using the composition according to the invention and the process for its preparation are obtained if the following formulation (in% by mass) is used: <tables id="tabl0004" num="0004"><table frame="all"><tgroup cols="2" colsep="1" rowsep="0"><colspec colnum="1" colname="col1" colwidth="78.75mm" /><colspec colnum="2" colname="col2" colwidth="78.75mm" /><tbody valign="top"><row><entry namest="col1" nameend="col1" align="left">Potassium nitrate with a specific particle surface of 2000 cm<sup>2</sup>/G</entry><entry namest="col2" nameend="col2" align="right">70</entry></row><row><entry namest="col1" nameend="col1" align="left">Dicyandiamide with an average particle size of 12 µm</entry><entry namest="col2" nameend="col2" align="right">12</entry></row><row><entry namest="col1" nameend="col1" align="left">Phenol formaldehyde resin as a 50% solution in a mixture of ethyl alcohol and acetone in a ratio of 50:50 (calculated as solid)</entry><entry namest="col2" nameend="col2" align="right">11</entry></row><row rowsep="1"><entry namest="col1" nameend="col1" align="left">Potassium benzoate with a specific particle surface of 600 cm<sup>2</sup>/G</entry><entry namest="col2" nameend="col2" align="right">7</entry></row></tbody></tgroup></table></tables>
The pre-ground powder components (potassium nitrate, dicyandiamide, potassium benzoate) are placed in a mixer and mixed for 10 minutes. Then a phenol formaldehyde resin solution is added in three equal portions. The contents of the mixer are mixed for 5 minutes after the addition of the appropriate portion of the formaldehyde resin. Mixing takes place at a temperature of 40 ° C with the lid open. The mixture thus obtained is emptied from the mixer and introduced through a sieve into a granulator with continuous gassing with hot air at a temperature of 40 ° C. The pre-dried granulate is placed in bands in 2-3 cm thick layers and dried for additional removal of moisture and volatile components up to 1%. The total time of mixing and granulating is approximately 1 hour.
The mixture thus obtained can be further dried in the compressed state if the moisture and volatile content exceeds 1%.
The pyrotechnic, aerosol-forming composition according to the invention and the process for its production make it possible to load aerosol fire extinguishing generators with it and, with their help, to effectively extinguish a fire of gaseous, liquid and solid combustible substances in stationary rooms, in means of transport in rail and road traffic, on ocean-going and river ships, in airplanes, among other things, to carry out in blow-through devices, for example in aircraft engines, as well as to determine fires and to prevent the spread of a fire at a special manufacturer to an explosion in storage rooms and in fire and explosion-prone production facilities.
1 sheet
Sheet 1
Every citation, both waysCites: the store holds 4 of 5
| Document | Relation | Office | Category | Cited during |
|---|---|---|---|---|
| GB2541195A | Cited by | United Kingdom | – | Search report |
| AU762661B2 | Cited by | Australia | – | Search report |
| RU2618261C1 | Cited by | Russian Federation | – | Search report |
| EP0976424A1 | Cited by | European Patent Office (EPO) | – | Search report |
| GB2541195B | Cited by | United Kingdom | – | Search report |
| EP0976423A1 | Cited by | European Patent Office (EPO) | – | Search report |
| US7481995B2 | Cited by | United States of America | – | Applicant |
| GB2541196B | Cited by | United Kingdom | – | Search report |
| US10850147B2 | Cited by | United States of America | – | Applicant |
| US11413486B2 | Cited by | United States of America | – | Applicant |
| GB2541196A | Cited by | United Kingdom | – | Search report |
| US6737044B1 | Cited by | United States of America | – | Applicant |
| EP0561035A1 | Cites | European Patent Office (EPO) | A | Search report |
| EP0561035A1 | Cites | European Patent Office (EPO) | A | Search report |
| WO9423800A1 | Cites | World Intellectual Property Organization (WIPO) | A | Search report |
| WO9423800A1 | Cites | World Intellectual Property Organization (WIPO) | A | Search report |
23 members in 8 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 96108059 | Russian Federation | A | |
| 96108059 | Russian Federation | A | |
| 96108059 | Russian Federation | – | |
| 96108059 | – | – | – |
| RU19960108059 | – | – | – |
Members23
| Document | Office | Kind | |
|---|---|---|---|
| NO971730D0 | Norway | D0 | |
| NO971839D0 | Norway | D0 | |
| RU2087170C1 | Russian Federation | C1 | |
| CA2203985A1 | Canada | A1 | |
| CA2203986A1 | Canada | A1 | |
| NO971730L | Norway | L | |
| NO971839L | Norway | L | |
| EP0804945A2 | European Patent Office (EPO) | A2 | |
| EP0804946A1This record | European Patent Office (EPO) | A1 | |
| DE19634006A1 | Germany | A1 | |
| DE19636725A1 | Germany | A1 | |
| RU2097079C1 | Russian Federation | C1 | |
| CN1166995A | China | A | |
| CN1166996A | China | A | |
| RU2101054C1 | Russian Federation | C1 | |
| DE19636725C2 | Germany | C2 | |
| DE19634006C2 | Germany | C2 | |
| US5831209A | United States of America | A | |
| US5865257A | United States of America | A | |
| EP0804945A3 | European Patent Office (EPO) | A3 | |
| US6042664A | United States of America | A | |
| CA2203986C | Canada | C | |
| SA99200481B1 | Saudi Arabia | B1 |
6 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Application deemed to be withdrawnWithdrawn18D | 18D | |
| Information on the status of an ep patent application or granted ep patentGrantedSTAA | STAA | |
| First examination report despatched17Q | 17Q | |
| Request for examination filed17P | 17P | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phasePUAI | PUAI |
Numbers
- Publication
- 0804946
- Publication, DOCDB
- 0804946
- Publication, EPODOC
- EP0804946
- Application
- 97106936
- Application, DOCDB
- 97106936
- Application, EPODOC
- EP19970106936
Titles3
- German
- Aerosolbildende Zusammensetzung zum Löschen von Bränden und Verfahren zur Herstellung dieser Zusammensetzung
- English
- Gas-producing composition for extinguishing fires and process for producing this composition
- French
- Composition génératrice de gaz pour extinction des feux et procédé pour la préparer
Classification
- CPC, 3
- A62C5/006
- A62D1/06
- Y10T292/0803
- IPC, 5
- A62C3 00
- A62C5 00
- A62D1 00
- A62D1 06
- C06B21 00
Designated states5
- Contracting states, 5
- Germany
- France
- United Kingdom
- Italy
- Sweden