Signal trigger type environment-friendly fire extinguishing core material coating structure

Abstract

The utility model belongs to fire extinguishing equipment technical field, concretely relates to a signal trigger type environmental protection fire extinguishing core material coating structure, including fireproof patch base, the one side of fireproof patch base is paved with a plurality of fire extinguishing microcapsule, is provided with water -sensitive color change unit in the inside of fire extinguashing microcapsule, and fire extinguishing microcapsule includes core material and the capsule shell layer that is wrapped in the outside of core material, water -sensitive color change unit is first water -sensitive color change particle, first water -sensitive color change particle sets up in the inside of capsule shell layer, first water -sensitive color change particle sets up in the inside of capsule shell layer and is close to the position of core material, and the material of first water -sensitive color change particle is cobalt salt compound, and core material includes core material unit and the shell layer that is wrapped in the outside of core material unit, and capsule shell layer is wrapped in the outside of shell layer. The utility model can let user understand whether signal trigger type environmental protection fire extinguishing core material coating structure is waterlogged, failure through observing color change, and it is convenient for user to evaluate microcapsule and carry out processing in time.

Description

Technical Field

[0001] This utility model belongs to the technical field of fire extinguishing equipment, specifically relating to a signal-triggered environmentally friendly fire extinguishing core material coating structure. Background Technology

[0002] In existing technologies, environmentally friendly fire extinguishing agents, represented by perfluorohexanone, are widely used in microencapsulated fire extinguishing materials due to their advantages such as high fire extinguishing efficiency, zero ozone depletion potential (ODP), and low global warming potential (GWP). To address the issues of perfluorohexanone's low boiling point (49°C) and high volatility, polymeric materials (such as methacrylate polymers) are typically used as the encapsulation layer to form fire extinguishing microcapsules, thereby enhancing its storage stability and reliability.

[0003] For example, Chinese patent CN114307028B discloses a fire extinguishing microcapsule core material, fire extinguishing microcapsules and their preparation method, which realizes further solidification and large-scale loading of perfluorohexanone fire extinguishing medium, with high fire extinguishing efficiency and wide range of applications.

[0004] However, existing fire extinguishing microcapsules lack monitoring of their encapsulation structure. During long-term storage or use, if moisture seeps into the microcapsules due to damage to the shell layer or a humid environment, it can cause the perfluorohexanone inside to hydrolyze and become ineffective. However, users cannot visually determine whether the microcapsules have become infiltrated or have failed, making it inconvenient for users to assess and treat the microcapsules in a timely manner. This may result in the fire extinguishing material failing to function properly when a fire occurs. Utility Model Content

[0005] The purpose of this invention is to provide a signal-triggered environmentally friendly fire extinguishing core material coating structure, which allows users to understand whether the signal-triggered environmentally friendly fire extinguishing core material coating structure has been water-infiltrated or failed by observing color changes, making it convenient for users to evaluate and treat the microcapsules in a timely manner.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A signal-triggered environmentally friendly fire extinguishing core material coating structure includes a fireproof patch substrate, on one side of which a plurality of fire extinguishing microcapsules are laid, and the interior of each fire extinguishing microcapsule is provided with a water-sensitive color-changing unit.

[0008] Furthermore, the fire extinguishing microcapsule includes a core material and a shell layer surrounding the core material, and the water-sensitive color-changing unit is a first water-sensitive color-changing particle, which is disposed inside the shell layer.

[0009] Furthermore, the first water-sensitive color-changing particle is disposed inside the shell layer near the core material.

[0010] Furthermore, the material of the first water-sensitive color-changing particle is a cobalt salt composite.

[0011] Furthermore, the core material includes a core unit and an outer shell layer wrapped around the core unit, the outer shell layer being wrapped around the outer shell layer, and a plurality of second water-sensitive color-changing particles being disposed inside the core material.

[0012] Furthermore, the core material unit is made of perfluorohexanone, and the outer shell layer is made of chitosan / sodium alginate.

[0013] Furthermore, the material of the second water-sensitive color-changing particle is a pH-sensitive indicator.

[0014] The technical effects achieved by this utility model are as follows:

[0015] This utility model discloses a signal-triggered environmentally friendly fire extinguishing core material coating structure. By setting water-sensitive color-changing units such as first water-sensitive color-changing particles and second water-sensitive color-changing particles inside the signal-triggered environmentally friendly fire extinguishing core material coating structure, users can understand whether the signal-triggered environmentally friendly fire extinguishing core material coating structure has water ingress or failed by observing the color change of the signal-triggered environmentally friendly fire extinguishing core material coating structure, which facilitates users to evaluate and treat the microcapsules in a timely manner. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the fire extinguishing microcapsule of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the fire extinguishing microcapsule of this utility model;

[0019] Figure 4 This is a cross-sectional side view of the fire extinguishing microcapsule of this utility model.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Fireproof patch substrate; 2. Fire extinguishing microcapsule; 3. Capsule shell layer; 4. Outer shell layer; 5. Core material unit; 6. First water-sensitive color-changing particle; 7. Second water-sensitive color-changing particle. Detailed Implementation

[0022] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0023] like Figures 1-4As shown, a signal-triggered environmentally friendly fire extinguishing core material coating structure includes a core material and a shell layer 3 wrapped around the outside of the core material. The core material and the shell layer 3 constitute a fire extinguishing microcapsule 2.

[0024] The shell layer 3 is preferably made of a polymer of methyl methacrylate and N,N-dimethylacrylamide. It is coated on the outside of the core material through a polymerization reaction to form a protective layer, which enhances the stability of the core material and prevents leakage of the core material.

[0025] like Figures 2-4 As shown, the core of this technical solution lies in the fact that several first water-sensitive color-changing particles 6 are arranged inside the shell layer 3 near the core material. The material of the first water-sensitive color-changing particles 6 is preferably a cobalt salt composite, such as cobalt chloride-silica gel composite. The first water-sensitive color-changing particles 6, as water-sensitive color-changing units, are blue when dry and turn pink when they come into contact with water. The color change is reversible. When water penetrates into the interface between the shell layer 3 and the core material, it will first come into contact with the first water-sensitive color-changing particles 6, causing the first water-sensitive color-changing particles 6 to change color when they come into contact with water. At this time, by observing the color of the first water-sensitive color-changing particles 6, it can be known whether rainwater has penetrated into the area near the core material. Thus, the color change can be used to warn users, allowing users to discover whether water has entered the shell layer 3 by observing the color change. This enables timely drying of the signal-triggered environmentally friendly fire extinguishing core material covering structure. After the drying process is completed, the color of the first water-sensitive color-changing particles 6 automatically returns to blue.

[0026] It should be noted that the principle of water-sensitive color change of cobalt chloride-silica gel composite has been widely used in the field of traditional color-changing silica gel desiccants. In these desiccants, cobalt chloride is loaded onto the surface of silica gel to visually indicate the degree of moisture absorption of the desiccant, thereby reflecting changes in ambient humidity and reminding users whether the desiccant needs to be replaced or regenerated.

[0027] like Figures 2-4 As shown, in some embodiments, the core material includes a core unit 5 and an outer shell layer 4 that wraps around the core unit 5, wherein the outer shell layer 3 wraps around the outer shell layer 4.

[0028] Among them, the core material unit 5 is preferably made of perfluorohexanone. Perfluorohexanone is a liquid at room temperature and pressure, with a low boiling point (49℃) and easy vaporization. It also has high fire extinguishing efficiency, excellent environmental performance, and an ODP (ozone depletion potential) of 0, with a low global warming potential.

[0029] The outer shell layer 4 is preferably made of chitosan / sodium alginate, which forms a dense film through a gelation reaction, tightly wrapping the core material unit 5. This prevents the core material unit 5 from volatilizing and allows it to break down quickly under high temperature conditions, ensuring that the core material unit 5 is released in a timely manner.

[0030] like Figures 2-4As shown, in some embodiments, the core material contains several second water-sensitive color-changing particles 7. The material of the second water-sensitive color-changing particles 7 is preferably a pH-sensitive indicator, such as porous nano-silica supported on bromocresol green. When perfluorohexanone is exposed to water and undergoes a small amount of hydrolysis to produce acidic substances, the pH value of the environment decreases. The second water-sensitive color-changing particles 7, as water-sensitive color-changing units, can change from blue-green to yellow when the pH value of the environment decreases. The color change is irreversible, and the nano-silica does not affect the polymerization reaction of the shell layer 3. Thus, the color change can be used to warn the user, allowing the user to detect whether water has entered the core material by observing whether the color has changed to yellow. This makes it relatively easy to determine whether the perfluorohexanone inside the core material has been deactivated by rainwater.

[0031] The principle of water-reactive color change of porous nano-silica supported on bromocresol green is widely used in acid-base titration analysis in chemical experiments. It is often used to indicate changes in the pH value of a solution and to determine the titration endpoint.

[0032] In some embodiments, the signal-triggered environmentally friendly fire extinguishing core material coating structure also includes a fireproof patch substrate 1, and several fire extinguishing microcapsules 2 are laid on one side of the fireproof patch substrate 1. At this time, when some of the fire extinguishing microcapsules 2 on the fireproof patch substrate 1 change color when they come into contact with water, the color changes of many microcapsules are superimposed to each other, forming macroscopically visible color blocks. For example, the entire area changes from its original color to pink, thereby achieving visual monitoring with the naked eye.

[0033] The base material of the fireproof patch 1 can be an inorganic fiber material with good fire resistance, such as ceramic fiber or glass fiber. These materials are resistant to high temperatures and have good thermal insulation properties, which can effectively prevent the spread of flames and at the same time play a role in supporting and protecting the fire extinguishing microcapsule 2. Alternatively, flame-retardant polymer materials, such as flame-retardant polypropylene or flame-retardant epoxy resin, can be used. These materials have a certain degree of flexibility, making them easy to process and mold according to different application scenarios, and can be tightly bonded to the fire extinguishing microcapsule 2 to ensure structural stability.

[0034] The working principle of this utility model is as follows:

[0035] The main signal triggering for this structure comes from temperature and moisture.

[0036] Regarding temperature, when a fire occurs in the surrounding environment and the temperature rises to a certain level, the outer shell layer 3 and outer shell layer 4 will soften and weaken due to heat. The internal perfluorohexanone core material unit 5 will vaporize and expand due to heat, generating sufficient pressure to rupture the outer shell layer 3 and outer shell layer 4, releasing it into the environment. The vaporization of perfluorohexanone absorbs a large amount of heat, lowering the ambient temperature. At the same time, the density of gaseous perfluorohexanone is higher than that of air, so it will cover the flame surface, isolating oxygen and thus extinguishing the fire.

[0037] Regarding moisture, when moisture intrudes, the first water-sensitive color-changing particle 6 and the second water-sensitive color-changing particle 7 will emit signals based on their own water-reactive color-changing characteristics to remind users of the potential risk of water ingress, thus preventing perfluorohexanone from becoming ineffective or affecting the stability of the microcapsule structure, which in turn affects the fire extinguishing performance.

[0038] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A signal-triggered environmentally friendly fire extinguishing core material coating structure, characterized in that: It includes a fireproof patch substrate (1), and a plurality of fire extinguishing microcapsules (2) are laid on one side of the fireproof patch substrate (1), and the fire extinguishing microcapsules (2) are provided with water-sensitive color-changing units inside.

2. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 1, characterized in that: The fire extinguishing microcapsule (2) includes a core material and a shell layer (3) wrapped around the outside of the core material. The water-sensitive color-changing unit is a first water-sensitive color-changing particle (6), which is disposed inside the shell layer (3).

3. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 2, characterized in that: The first water-sensitive color-changing particle (6) is disposed inside the shell layer (3) near the core material.

4. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 2, characterized in that: The first water-sensitive color-changing particle (6) is made of a cobalt salt composite.

5. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 3, characterized in that: The core material includes a core unit (5) and an outer shell layer (4) wrapped around the core unit (5). The outer shell layer (3) is wrapped around the outer shell layer (4). The core material contains a plurality of second water-sensitive color-changing particles (7).

6. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 5, characterized in that: The core material unit (5) is made of perfluorohexanone, and the outer shell layer (4) is made of chitosan / sodium alginate.

7. The signal-triggered environmentally friendly fire extinguishing core material coating structure according to claim 5, characterized in that: The material of the second water-sensitive color-changing particle (7) is a pH-sensitive indicator.

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