RU2631867C1 - Cord for fire-extinguishment and method of its manufacture (versions) - Google Patents

Abstract

FIELD: fire safety.

SUBSTANCE: fire-extinguishing cord is described, which comprises a room temperature curable composition comprising a low molecular weight dimethylsiloxane SKTN rubber as a binder, a cold curing catalyst for siloxane rubber, an ammonium perchlorate oxidizer, dry particulate microcapsules with a core of an extinguishing agent encapsulated in a polymer shell, and combustion catalyst ferrocene is used in the following ratio of the components of the composition, pts wt: low molecular weight dimethylsiloxane rubber SKTN - 17, ammonium perchlorate - 18, microcapsules with extinguishing agent - 65, hardener ethylsilicate-32 - 0.1-1, cold curing catalyst for siloxane rubber - dibutyltinoladaurinate - 0.05-0.5, ferrocene combustion catalyst - 0,05-2. Methods of the cord manufacture are also described.

EFFECT: manufacture of a cord having high reliability in operation, which contains an extinguishing composite material having a high fire-fighting efficiency.

11 cl, 16 ex

Description

The invention relates to composite fire extinguishing means, in particular to powdered microencapsulated extinguishing agents, extinguishing materials and coatings containing an extinguishing agent in the form of microcapsules.

From RU 144062 U1, publ. 08/10/2014, a fire extinguishing agent is known - a cord containing a microencapsulated fire extinguishing agent that works when a fire occurs in the protected facility, at the site of the highest temperature, the proposed agent is initiated (launched). As a result of the low-temperature combustion of the extinguishing cord, the protected object is filled with extinguishing gases and aerosols, and filling begins directly from the ignition site, which is especially effective for extinguishing long cable channels, collectors and raised floors. As a result of the release of extinguishing gases and aerosols, the fire is extinguished.

From RU 145590 09/20/2014 U1, there is known an autonomous fire extinguishing device comprising a layer of extinguishing agent deposited on its surface, which is made on the basis of a flame-retardant cord of an arbitrary cross-sectional shape or flame retardant tape, the cord or tape being coated with a non-combustible or partially combustible non-conductive gas-permeable shell over which a layer of a mixture of microcapsules of a fire extinguishing composition with a polymer binder is applied.

From RU 152765 U1, publ. 06/20/2015 a self-contained fire extinguishing agent with a thermally activated microencapsulated extinguishing agent containing a cured plasticized dibutyl phthalate plasticized polyvinyl acetate resin and a mixture of microcapsules containing halogen-containing aliphatic saturated hydrocarbons from refrigerant class as a fire extinguishing agent is known.

From US 20130313466 A1, publ. 11.28.2013 a self-contained fire extinguishing agent is known, including a fire extinguishing agent containing microcapsules with a fire extinguishing composition, as a core and a polyurethane shell.

Also, from RU 2469761 C1, publ. 12/20/2012 it is known to obtain a microencapsulated extinguishing agent containing microcapsules having a core of a spatially crosslinked polymer inside a spherical polymer shell made of a fire extinguishing liquid, in which the polymer shell contains nanoparticles of a mineral filler in the form of plates having a thickness of 1-5 nm, and has the ability of explosive destruction in the temperature range of 90-270 ° C.

The prior art solution is known - RU 2559480 C2, publ. 08/10/2015, in which the cable, made as a cord for fire extinguishing, uses composite fire extinguishing means, in particular powdered microencapsulated extinguishing agents containing a fire extinguishing agent in the form of microcapsules, designed to extinguish fires in hard-to-reach fire hazardous places without human intervention. The microencapsulated extinguishing agent contains a microcapsule consisting of a spherical polymer shell and a core of a fire extinguishing liquid, while the shell contains an additional outer layer, which has a maximum absorption coefficient of radiant energy for this type of coating. An additional coating is applied at the final stage of microcapsule formation by coloring the shell in black.

A disadvantage of the known solutions can be considered insufficient extinguishing efficiency and the number of components that make up the fire extinguishing composition and form toxic waste.

The closest is the invention, known from patent EP 869303, which describes a fire-resistant cable made in the form of a cord, comprising a housing in the form of a frame of a U-shaped profile, between the sides of which there is mineral wool or fiberglass insulation and a layer of intumescent composition.

The disadvantage of analogue are low strength during operation, large dimensions, as well as the hygroscopicity of the material included in the cord.

The closest is the cord, known from RU 2014145602 A, publ. 06/10/2016. This document describes a cord of a fire-extinguishing composite material by molding in the form of a cord by forcing on a substrate having an L-shaped shape.

The technical result of the invention consists in the manufacture of a cord having high reliability during operation, which contains an extinguishing composite material having high efficiency in fire fighting.

The technical result of the invention is to obtain a fire extinguishing composite material that eliminates the disadvantages of the prototype. At the same time, the new claimed material has high reliability and increased extinguishing efficiency, which is due to the fact that the U-shaped profile of the molding substrate is used in the manufacture of the cord, while the cord contains a braid of glass filament, and a lower composition is used in the composition (in comparison with known analogues ) the amount of ammonium perchlorate, which in turn provides a reduced amount of toxic hydrogen chloride in the combustion products of the composite. For speed, stability of combustion and completeness of combustion, the original Ferrocene substance was introduced into the composition, which provides an unexpected technical result, and to adjust the physicomechanical properties and curing time, a system of two separate components is used, a hardener and a cold curing accelerator.

The technical result is achieved by the fact that the claimed fire extinguishing cord includes a room temperature curable composition comprising a SKTN low molecular weight dimethylsiloxane rubber, a cold curing catalyst for siloxane rubber, an oxidizing agent, ammonium perchlorate, dry bulk microcapsules with a core fire extinguishing agent, and ferrocene combustion catalyst in the following ratio of composition components, parts by weight:

low molecular weight dimethylsiloxane rubber SKTN 17 ammonium perchlorate eighteen extinguishing agent microcapsules 65 hardener ethyl silicate-32 0.1-1 siloxane rubber cold curing catalyst - dibutyltinvadilaurinate 0.05-0.5 ferrocene combustion catalyst 0.05-2

In another aspect of the invention, there is provided a fire extinguishing cord comprising an extinguishing composite material in which the polymer shell of the microcapsules with the core of the extinguishing agent is made of a polyurea polymer.

Also proposed is a cord containing a composite material in which microcapsules contain liquid or gaseous halogen-containing hydrocarbon compounds as an extinguishing agent.

In other aspects of the invention, a cord is provided that comprises an extinguishing composite material in which the polymer shell of the microcapsules with the core of the extinguishing agent is made of a polyurea polymer,

or a composite material in which the microcapsules contain liquid or gaseous halogen-containing hydrocarbon compounds as an extinguishing agent,

or an extinguishing composite material in which the extinguishing agent of the microcapsule as a liquid or gaseous halogen-containing hydrocarbon compounds contains partially or fully halogenated saturated hydrocarbons, including linear, cyclic and branched compounds.

It is also possible that the fire extinguishing cord contains an extinguishing composite material in which microcapsules as a fire extinguishing agent, the microcapsules contain partially or fully fluorinated saturated hydrocarbons of a linear and / or cyclic structure, including branched compounds.

It is also possible that the fire extinguishing cord contains an extinguishing composite material in which microcapsules as an extinguishing agent, the microcapsules contain at least one substance selected from the group consisting of 2-iodoheptafluoropropane, 1,1,2,2-tetrafluorodibromoethane, perfluoro (ethyl- isopropyl ketone), 1,2-dibromohexafluoropropane, 1,4-dibromoctafluorobutane, 1,1,1,2,3,3,3-heptafluoropropane, octofluorocyclobutane.

Another aspect of the invention describes a method of manufacturing a fire extinguishing cord such as described above, comprising the steps of forming a curable composition by forcing it onto a substrate having a U-shaped profile and curing the composite material at room temperature for a predetermined time to obtain a curly-shaped cord and passing through the braid .

In one embodiment, the braid of the cord is made of glass fiber grade VMPS8.

In one embodiment, a method for manufacturing a fire-extinguishing cord by an extrusion method is claimed, comprising the steps of loading a curable composition into a mold of a plunger or worm press, pressing and holding in this form for 10-40 minutes at an elevated temperature of 40-70 ° C, then pressing the composition into long cords U-shaped cross-section through the corresponding die and further feeding to the braid.

The described method has a continuous cycle.

Thus, the use of glass fiber VMPS8 provided a solution to the problem of periodic tearing during the operation of the braiding machine, and also improved the appearance of the cord and its strength.

The use of a U-shaped profile of the molding substrate allowed us to solve the problem of the appearance of shells and voids during spreading.

In addition, the cord is easier to wind, it does not twist, and the braid lays more tightly.

Also in the new cord there is a greater specific content of capsules per meter of length, which increases the efficiency of using one meter when extinguishing.

Included in the fire fighting cord of the proposed composition contains a reduced amount of ammonium perchlorate, which provides a reduced amount of toxic hydrogen chloride in the combustion products of the composite.

To adjust the speed, completeness and stability of combustion in the composition used ferrocene.

To obtain the necessary physical and mechanical properties and curing times over a wide range, instead of a ready-made cold curing catalyst, a system of two separate components was used - a hardener (ethyl silicate-32), a cold curing accelerator (dibutyltin vanadylurinate).

In order to increase the extinguishing efficiency and create conditions for flameless operation, a fire extinguishing agent in the amount of 65 parts by weight was used.

Examples

Example 1

A cord is made for fire fighting by molding a curable composition by forcing it onto a substrate having a U-shaped profile and curing the composite material at room temperature for a predetermined time to obtain a cord of shaped cross section, which is placed in a braid from a glass fiber of VMPS 8. The curable composition has the following composition, parts by weight: low molecular weight dimethylsiloxane rubber SKTN - 17, ethyl silicate-32 - 0.1, dibutyltin vodilaurate - 0.05, ammonium perchlorate - 18, dry bulk microcapsules s with a core of extinguishing agent enclosed in a polymer shell - 65, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 2-iodoheptafluoropropane, were used.

In all cases of using freon feed gases, the process was carried out under pressure to liquefy the feed gas of freon.

Example 2

A fire fighting cord is made according to the method of Example 1, using the above-described components in the indicated amount in the presence of an anti-caking additive - ammonium nitrate with urea and adding ethyl silicate-32 - 0.5 parts by weight, and dibutyltin vodilaurate - 0.2 parts by weight ., ferrocene - 0.1. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,1,2,2-tetrafluorodibromoethane, were used.

Example 3

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added - 0.6 parts by weight, dibutyltin tadilaurinate - 0.3 parts by weight, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent - perfluorine (ethyl isopropyl ketone) were used.

Example 4

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,2-dibromhexafluoropropane, were used.

Example 5

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,4-dibromoctafluorobutane, were used.

Example 6

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,1,1,2,3,3,3-heptafluoropropane, were used.

Example 7

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, trifluoroiodomethane, were used. The process is carried out under pressure to liquefy the original gaseous freon.

Example 8

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. Octafluorocyclobutane, a microcapsule based on a polyurethane shell with a fire extinguishing agent, was used as microcapsules with an extinguishing agent.

Example 9

A fire-fighting cord is made according to the procedure of Example 1, the above-described components are used in the indicated amount, while ethyl silicate-32 is added, 0.6 parts by weight, and dibutyltin vodilaurate is 0.3 parts by weight, ferrocene is 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,2-trifluorotrichloroethane, were used.

Example 10

A cord is made for fire extinguishing by extrusion, in which the curable composition is loaded into the mold of the plunger press, pressed and held in this form for a certain time - 10 minutes at an elevated temperature of 40 ° C, then the composition is pressed into long cords of a U-shaped cross section through the appropriate die and then served on the braid. The described method has a continuous cycle. The curable composition in this case has the following composition, parts by weight: low molecular weight dimethylsiloxane rubber SKTN - 17, ethyl silicate 32 - 0.1, dibutyltin vodilaurate - 0.05, ammonium perchlorate - 18, dry bulk microcapsules with a core of fire extinguishing agent enclosed in polymer shell - 65, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 2-iodoheptafluoropropane, were used.

Example 11

According to the method of Example 7, an extruder extinguishing cord is made in which the curable composition is loaded into the mold of the worm press, pressed and held for a certain time for 15 minutes at an elevated temperature of 50 ° C, then the composition is pressed into long U-shaped cords sections through the corresponding die and then served on the braid. The described method has a continuous cycle. The curable composition in this case has the following composition, parts by weight: low molecular weight dimethylsiloxane rubber SKTN - 17, ethyl silicate 32 - 0.1, dibutyltin vodilaurate - 0.05, ammonium perchlorate - 18, dry bulk microcapsules with a core of fire extinguishing agent enclosed in polymer shell - 65, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 2-iodoheptafluoropropane, were used.

Example 12

According to the method according to Example 7 or 8, at the exposure time of 20 min and a temperature of 55 ° C, the above-described components are used in the indicated amount in the presence of an anti-caking additive - ammonium nitrate with urea, while ethyl silicate-32 is added - 0.5 parts by weight, and dibutyltin vodilaurate - 0.2 parts by weight, ferrocene - 0.1. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,1,2,2-tetrafluorodibromoethane, were used.

Example 13

According to the method of Example 7, at the exposure time of 30 minutes and a temperature of 60 ° C, the above-described components are used in the indicated amount, while ethyl silicate-32 is added - 0.6 parts by weight, and dibutyltin vodilaurate - 0.3 parts by weight, ferrocene - 0 , 05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent - perfluorine (ethyl isopropyl ketone) were used.

Example 14

According to the method according to Example 7 or 8, at the exposure time of 35 minutes and a temperature of 65 ° C, the above-described components are used in the indicated amount, while ethyl silicate-32 is added - 0.6 parts by weight, and dibutyltin vodilaurate - 0.3 parts by weight, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,2-dibromhexafluoropropane, were used.

Example 15

According to the method according to Example 7 or 8, at the exposure time of 35 minutes and a temperature of 65 ° C, the above-described components are used in the indicated amount, while ethyl silicate-32 is added - 0.6 parts by weight, and dibutyltin vodilaurate - 0.3 parts by weight, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent -1,4-dibromoctafluorobutane were used.

Example 16

According to the method according to Example 7 or 8, at the exposure time of 40 minutes and a temperature of 70 ° C, the above-described components are used in the indicated amount, while ethyl silicate-32 is added - 0.6 parts by weight, and dibutyltin vodilaurate - 0.3 parts by weight, ferrocene - 0.05. As microcapsules with an extinguishing agent, microcapsules based on a polyurethane shell with an extinguishing agent, 1,1,1,2,3,3,3-heptafluoropropane, were used.

Claims (12)

1. Fire extinguishing cord containing a fire-extinguishing composite material made of a room temperature curable composition including a low molecular weight dimethylsiloxane rubber SKTN, a catalyst for cold curing siloxane rubber, an oxidizing agent, ammonium perchlorate, a dry, free-flowing microcapsule containing polymer core the shell and the combustion catalyst ferrocene in the following ratio of components of the composition, wt. hours: low molecular weight dimethylsiloxane rubber SKTN 17 ammonium perchlorate eighteen extinguishing agent microcapsules 65 hardener ethyl silicate-32 0.1-1 siloxane rubber cold curing catalyst - dibutyltinvadilaurinate 0.05-0.5 ferrocene combustion catalyst 0.05-2 2. Cord for fire fighting according to claim 1, characterized in that it contains an extinguishing composite material in which the polymer shell of the microcapsules with the core of the extinguishing agent is made of polyurea polymer. 3. Cord for fire fighting according to any one of paragraphs. 1, 2, characterized in that the composite material in which the microcapsules contain liquid or gaseous halogen-containing hydrocarbon compounds as an extinguishing agent. 4. Cord for fire fighting according to any one of paragraphs. 1, 2, characterized in that the extinguishing composite material in which the extinguishing agent of the microcapsule as a liquid or gaseous halogen-containing hydrocarbon compounds contains partially or fully halogenated saturated hydrocarbons, including linear, cyclic and branched compounds. 5. The fire extinguishing cord according to claim 4, characterized in that it contains an extinguishing composite material, in which the microcapsules as a fire extinguishing agent, the microcapsules contain partially or fully fluorinated saturated hydrocarbons of a linear and / or cyclic structure, including branched compounds. 6. Cord for fire fighting according to any one of paragraphs. 1, 2, characterized in that it contains an extinguishing composite material, in which microcapsules as an extinguishing agent, the microcapsules contain at least one substance selected from the group consisting of 2-iodoheptafluoropropane, 1,1,2,2-tetrafluorodibromoethane, perfluoro (ethyl -isopropyl ketone), 1,2-dibromohexafluoropropane, 1,4-dibromoctafluorobutane, 1,1,1,2,3,3,3-heptafluoropropane, octofluorocyclobutane. 7. A method of manufacturing a cord for fire fighting according to any one of paragraphs. 1-6, which includes the stage of molding the curable composition by pressing on a substrate having a U-shaped profile, and curing the composite material at room temperature for a predetermined time to obtain a cord of shaped section and passing through the braid. 8. The method according to p. 7, characterized in that the braid is made of glass fiber grade VPS 8. 9. A method of manufacturing a cord for fire fighting according to any one of paragraphs. 1-6 by extrusion, containing the stage of loading the curable composition into a mold of a plunger or worm press, pressing and holding in this form for 10-40 minutes at an elevated temperature of 40-70 ° C, then extruding the composition into long cords of a U-shaped cross section through the appropriate die and further filing on the braid. 10. A method of manufacturing a fire extinguishing cord according to claim 9, characterized in that the method has a continuous cycle. 11. The method according to p. 9, characterized in that the braid is made of glass fiber grade VPS 8.