Passive self-sensing fire extinguishing belt

Abstract

The invention relates to a passive self-sensing fire extinguishing belt which effectively solves the problems that a core material is low in load rate, complex in preparation process and poor in stability, a fire extinguishing agent is prone to leakage in the storage process, and potential risks are brought to an ecological environment system. According to the technical scheme, the fire extinguishing device comprises a strip-shaped main body, the main body comprises an outer layer and a fire extinguishing agent microcapsule filled in the outer layer, the fire extinguishing agent microcapsule comprises a shell and a fire extinguishing agent wrapped in the shell, the outer layer and the shell can be damaged when encountering fire, and the fire extinguishing agent is released; the fire extinguishing agent is one of tetrafluorodibromoethane, perfluorohexanone and homologues of tetrafluorodibromoethane and perfluorohexanone, and the shell is made of a bio-based composite material; the embedding rate and the stability of the fire extinguishing agent can be improved, and meanwhile, the fire extinguishing agent has excellent fire extinguishing performance, stability and air tightness, has the advantages of being green, environmentally friendly, non-toxic and the like, and has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguishing, and specifically to a self-sensing fire extinguishing belt without a power source. Background Art

[0002] Self-sensing fire extinguishing materials are mainly used for accidental fires of electrical equipment such as computer rooms and electrical cabinets; halogenated hydrocarbon liquids are currently common green and environmentally friendly fire extinguishing agents. However, most halogenated hydrocarbon fire extinguishing agents also have some obvious disadvantages such as low boiling point, high cost, and unsuitable for storage. How to improve the stability of halogenated hydrocarbon fire extinguishing agents has become a current research hotspot.

[0003] Coating and granulating halogenated hydrocarbon fire extinguishing agents, that is, using halogenated hydrocarbon fire extinguishing agents as core materials and polymer materials as wall materials to prepare fire extinguishing agent coated particles, is a very ideal choice, which can realize the easy storage and convenient use of halogenated hydrocarbon fire extinguishing agents.

[0004] Patent CN113181589B points out that melamine urea formaldehyde resin is used to encapsulate mixed fire extinguishing agents such as perfluorocyclohexanone and heptafluorocyclopentane and is applied to the fire extinguishing of lithium-ion batteries. However, the fire extinguishing agents prepared by this method have disadvantages such as low loading rate and limited fire extinguishing effect.

[0005] Patent CN109420281A adds some adsorbent materials such as polymer resins, fibers, and inorganic fillers to adsorb or dissolve halogenated hydrocarbon fire extinguishing agents to reduce the volatility of the fire extinguishing agents. However, usually the interaction between these materials and the fire extinguishing agents is weak, the stability is significantly affected, and the fire extinguishing effect is limited.

[0006] Patent CN113230577A discloses a microcapsule with urea formaldehyde resin as the wall material for encapsulating halogenated hydrocarbon fire extinguishing agents. However, the synthesis reaction temperature of the coated particles needs to be controlled at 70 - 120°C, which is significantly higher than the boiling point of 50°C of the fire extinguishing agent, resulting in the loss of the fire extinguishing agent.

[0007] The coated particles prepared by the methods reported above have problems such as low core material loading rate, complex preparation process, poor stability, easy leakage of the fire extinguishing agent during storage, and potential risks to the ecological environment system. Summary of the Invention

[0008] The present invention provides a self-sensing fire extinguishing belt without a power source to solve the above problems.

[0009] The technical solution it adopts includes a strip-shaped main body, which consists of an outer layer and fire extinguishing agent microcapsules filled in the outer layer. The fire extinguishing agent microcapsules include a shell and a fire extinguishing agent composition wrapped inside the shell. The outer layer and the shell will be damaged when encountering fire, releasing the fire extinguishing agent composition; the fire extinguishing agent composition is one of 1,2-dibromo-1,1,2,2-tetrafluoroethane, perfluorohexanone and their homologues, and the shell is a bio-based composite material.

[0010] The bio-based composite material of the shell is the product of the interfacial polymerization reaction of lignin and polyamine at 40 to 50 °C.

[0011] The outer layer is woven from basalt fibers.

[0012] Both ends of the main body are provided with connectors.

[0013] A thermal sensitive wire wrapped inside the fire extinguishing agent microcapsules is arranged inside the outer layer. The thermal sensitive wire is arranged along the length direction of the main body and is of the same length as the main body.

[0014] The present invention uses the bio-based composite material obtained by the interfacial polymerization reaction of lignin and polyamine at 40 to 50 °C as the shell of the fire extinguishing agent composition. The polymerization reaction temperature is lower than the boiling point of the core material, ensuring that the fire extinguishing agent is wrapped inside the wall material in a liquid form, improving the embedding rate and stability of the fire extinguishing agent. At the same time, it has excellent fire extinguishing performance, stability and airtightness, and has the advantages of being green, environmentally friendly and non-toxic, and has good application prospects. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the present invention.

[0016] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0017] Figure 3 It is a schematic diagram of the fire extinguishing agent microcapsules. Detailed Embodiments

[0018] Combined with the drawings, the present invention includes a strip-shaped main body 1, which consists of an outer layer 2 and fire extinguishing agent microcapsules 3 filled in the outer layer 2. The fire extinguishing agent microcapsules 3 include a shell 4 and a fire extinguishing agent composition 5 wrapped inside the shell 4. The outer layer 2 and the shell 4 will be damaged when encountering fire, releasing the fire extinguishing agent composition 5; the fire extinguishing agent composition 5 is one of 1,2-dibromo-1,1,2,2-tetrafluoroethane, perfluorohexanone and their homologues, and the shell 4 is a bio-based composite material; this fire extinguishing belt is coiled inside the electrical cabinet. When there is no fire, the outer layer 2 and the shell 4 remain intact, wrapping the fire extinguishing agent composition 5 in a stable state. When a fire occurs, the outer layer 2 and the shell 4 break at high temperature, and the fire extinguishing agent composition 5 is released to extinguish the fire.

[0019] The bio-based composite material of the outer shell 4 is a product of interfacial polymerization reaction between lignin and polyamine at 40 to 50 °C; the boiling point of the fire extinguishing agent 5 is 50 °C, and the polymerization reaction temperature is lower than the boiling point of the fire extinguishing agent 5, ensuring that the fire extinguishing agent 5 is wrapped inside the outer shell 4 in a liquid form, improving the embedding rate and stability of the fire extinguishing agent 5.

[0020] The outer layer 2 is woven from basalt fibers.

[0021] Connectors 6 are provided at both ends of the main body 1. The connectors 6 can prevent the fire extinguishing agent microcapsules 3 from spilling from the ends and also prevent moisture from entering the main body 1 from the ends to make the fire extinguishing agent microcapsules 3 damp.

[0022] A heat-sensitive wire 7 wrapped inside the fire extinguishing agent microcapsules 3 is provided inside the outer layer 2. The heat-sensitive wire 7 is arranged along the length direction of the main body 1 and is as long as the main body 1; the heat-sensitive wire 7 plays a role in igniting the outer shell 4 during a fire, reducing the temperature limit for the release of the fire extinguishing agent 5. In the absence of the heat-sensitive wire 7, the temperature at which the outer shell 4 burns and is damaged is about 200 °C. After the heat-sensitive wire 7 is provided, when the temperature reaches about 150 °C, the heat-sensitive wire 7 can burn and then ignite the outer shell 4.

[0023] The fire extinguishing principle of the present invention is as follows: when there is no fire inside the electrical cabinet, the fire extinguishing agent microcapsules 3 will not break to release the fire extinguishing agent 5. When the temperature inside the cabinet rises due to a fire and ignites the heat-sensitive wire 7, the heat-sensitive wire 7 then ignites the outer shell 4. At the same time, the fire extinguishing agent 5 inside the outer shell 4 expands due to heat. Under the action of combustion damage and the expansion of the internal fire extinguishing agent 5, the outer shell 4 breaks, and the fire extinguishing agent 5 is released and vaporized into perfluorhexanone gas. This vaporization reaction process requires a large amount of heat absorption, cooling the environment. At the same time, the perfluorhexanone gas quickly covers the surface of the fire source and the objects inside the cabinet, forming an oxygen isolation layer, thereby achieving the purpose of extinguishing the fire.

[0024] The polymerization reaction temperature of the outer shell 4 of the present invention is lower than the boiling point of the core material, ensuring that the fire extinguishing agent is wrapped inside the wall material in a liquid form, improving the embedding rate and stability of the fire extinguishing agent. At the same time, it has excellent fire extinguishing performance, stability and airtightness, and has the advantages of being green, environmentally friendly and non-toxic, and has good application prospects.

Claims

1. A self - contained induction fire - extinguishing belt, comprising a strip - shaped main body (1), the main body (1) consisting of an outer layer (2) and fire - extinguishing agent micro - capsules (3) filled in the outer layer (2), characterized in that, The fire extinguishing agent microcapsule (3) consists of a shell (4) and a fire extinguishing agent chemical (5) wrapped inside the shell (4). The outer layer (2) and the shell (4) will be damaged when encountering fire, releasing the fire extinguishing agent chemical (5). The fire extinguishing agent chemical (5) is one of 1,2-dibromo-1,1,2,2-tetrafluoroethane, perfluoromethylcyclohexanone and their homologues. The shell (4) is a bio-based composite material.

2. The self - inductive fire - extinguishing belt without power source according to claim 1, wherein, The bio-based composite material of the shell (4) is obtained by interfacial polymerization reaction of lignin and polyamine at 40 to 50 °C.

3. The self - inductive fire - extinguishing belt without power source according to claim 1, characterized in that, The outer layer (2) is woven from basalt fibers.

4. The self - inductive fire - extinguishing belt without power source according to claim 1, characterized in that, Connectors (6) are provided at both ends of the main body (1).

5. The self - powered induction fire - extinguishing belt according to claim 1, wherein, A thermal fuse (7) wrapped inside the fire extinguishing agent microcapsule (3) is provided inside the outer layer (2). The thermal fuse (7) is arranged along the length direction of the main body (1) and is as long as the main body (1).

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