Nano fire extinguishing capsule and preparation method thereof

Abstract

The invention relates to the technical field of fire extinguishing materials, and discloses a nano fire extinguishing capsule which is prepared from the following components in percentage by mass: 50% of heat conduction powder, 15% of vinyl silicone oil, 1% of a platinum catalyst, 2% of hydrogen-containing silicone oil, 0.7% of a 50U release film, 1% of black color paste, 0.3% of an inhibitor and 30% of a nano fire extinguishing capsule shell. The fire extinguishing capsule is composed of heat conduction powder, vinyl silicone oil, a platinum catalyst, hydrogen-containing silicone oil, a 50U release film, black color paste, an inhibitor and a nanometer fire extinguishing capsule shell, and has the three-in-one functions of fire prevention, fire extinguishing and rescue; the nano fire extinguishing capsule can rapidly extinguish different types of fire disasters, and especially plays a great role in places where fire disasters easily occur, such as buildings and underground garages; the nanometer fire extinguishing capsule is filled with a nanometer material with high-temperature resistance and heat insulation effect, and the nanometer material can well absorb and transfer heat energy in a fire disaster and effectively reduce the fire behavior expansion speed.

Description

Technical Field

[0001] The invention relates to the technical field of fire extinguishing materials, in particular to a nano fire extinguishing capsule and a preparation method thereof. Background Art

[0002] Nano fire extinguishing capsule is an innovative fire extinguishing technology. It uses nanocapsule technology to encapsulate the composite fire extinguishing agent in tiny capsules. Each capsule is about 10 to 50 microns in size and is impermeable. It can ensure that the fire extinguishing agent is stored safely and efficiently and is ready to be released at any time.

[0003] Nano fire extinguishing capsules can be safely stored for many years under normal circumstances and respond to fire extinguishing needs at any time. When a fire occurs, the glue will react to the external temperature rise and release the fire extinguishing agent when the preset response temperature is reached. Only the capsule closest to the heat source will release the fire extinguishing agent to extinguish the fire, while the other parts remain intact to deal with the re-ignition of the fire;

[0004] Nano fire extinguishing capsules are widely used in various places, including crowded places such as homes, offices, schools, hospitals, as well as power, telecommunications, commercial, industrial and military facilities. Its automatic start-up, rapid fire extinguishing and no need for human intervention enable it to respond quickly when a fire occurs and effectively control the spread and spread of the fire. In addition, nano fire extinguishing capsules can also be used in power equipment, pipelines, bridges and other application scenarios with complex internal structures that require rapid fire extinguishing.

[0005] A Chinese patent discloses a nanocapsule fire extinguishing material and a preparation method thereof (Announcement No. CN117442920A). The patented technology uses cheap chitosan, adds Sc3+ and Ce3+ to modify it, and uses it as the shell material of the nanocapsule to improve the flexibility and ductility of chitosan in the solution, so that it can wrap the core material as much as possible. At the same time, under high temperature conditions, it is conducive to the release and spraying of the core material. At the same time, gelatin solution and gum arabic solution, as emulsifiers, can form a stable emulsion with the fire extinguishing agent and coolant used in the core material, which is conducive to the coating of the modified chitosan. The present invention realizes the solidification loading and large-scale loading of perfluorohexanone, solving the problem that perfluorohexanone is difficult to make into a fire extinguishing material. In addition, using perfluorohexanone as the core fire extinguishing medium is not only low in cost, but also does not release harmful substances during the fire extinguishing process, which is safe and environmentally friendly.

[0006] However, existing thermally conductive silicone products only have the properties of thermal conductivity, insulation, and flame retardancy, but do not have active fire extinguishing properties. Therefore, in current product applications, such as power batteries, when overheating occurs and open flames occur, fire extinguishing cannot be carried out immediately. At the same time, when used in other electronic products, the product overheats and open flames cannot be extinguished in time;

[0007] Existing silicone products with active fire extinguishing properties only have characteristics such as insulation and active fire extinguishing, but do not have good thermal conductivity. In the application of such products, they can only extinguish the open fire that has already occurred, and cannot effectively dissipate the heat during the heating process of electronic products in advance. Therefore, those skilled in the art have provided a nano fire extinguishing capsule and its preparation method to solve the problems raised in the above background technology. Summary of the Invention

[0008] The purpose of the present invention is to provide a nano fire extinguishing capsule and its preparation method to solve the problems raised in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] A nano fire extinguishing capsule, the fire extinguishing capsule is composed of the following components by mass percentage: 50% of thermal conductive powder, 15% of vinyl silicone oil, 1% of platinum catalyst, 2% of hydrogen-containing silicone oil, 0.7% of 50U release film, 1% of black pigment paste, 0.3% of inhibitor, and 30% of the nano fire extinguishing capsule shell.

[0011] As a further aspect of the present invention: the nano fire extinguishing capsule shell is a thermally conductive silicone sheet, the thermally conductive silicone sheet uses silicone resin as the raw material, and uses insulating and thermally conductive fillers, plasticizers, colorants, cross-linking agents, and catalysts as auxiliary materials. The production process of the thermally conductive silicone sheet mainly includes

[0012] S1. Raw material preparation: Select silicone resin with good stability and thermal conductivity, and prepare the auxiliary materials for preparing the thermally conductive silicone sheet;

[0013] S2. Plasticizing / mixing: Mix the raw materials prepared in S1 in a certain proportion, and carry out high-speed stirring in a mechanical stirrer to make the raw materials evenly dispersed. Through heating and mechanical shearing, the mixed silicone material is plasticized to obtain a plasticized silicone with a certain fluidity;

[0014] S3. Molding and vulcanization: Inject the plasticized silicone material into the mold, and form a thermally conductive silicone sheet with a specific shape and size through the pressing action of the mold, and carry out vulcanization treatment on the formed thermally conductive silicone sheet to realize the preparation of the nano fire extinguishing capsule shell.

[0015] As a further aspect of the present invention: the insulating and thermally conductive filler is one or more of alumina, magnesia, boron nitride, aluminum nitride, and quartz.

[0016] As a further aspect of the present invention: the plasticizer is dimethyl silicone oil or polyester plasticizer;

[0017] The colorant is silicone oil or phosphate ester;

[0018] The cross-linking agent is titanium oxide;

[0019] The catalyst is neodymium oxide or samarium oxide.

[0020] As a further aspect of the present invention: the preparation method of the nano fire extinguishing capsule is as follows,

[0021] A1. Raw material preparation: First, accurately weigh raw materials such as heat-conducting powder, vinyl silicone oil, platinum catalyst, hydrogen-containing silicone oil, 50U release film, black color paste and inhibitor, and prepare the nano fire extinguishing capsule shell material;

[0022] A2. Mixing and stirring: Add raw materials such as heat-conducting powder, vinyl silicone oil, platinum catalyst, and hydrogen-containing silicone oil into a reaction kettle according to a certain proportion, and start the stirrer to stir at a certain temperature to make the raw materials evenly mixed;

[0023] A21: Slowly add the inhibitor and black color paste after mixing evenly and continue stirring to make them evenly dispersed in the mixture;

[0024] A22: Finally, add the nano fire extinguishing capsule shell so that the shell evenly coats the surface of the mixture to form a nano capsule;

[0025] A3. Curing and forming: By adjusting conditions such as temperature and pressure, make the shell material cure to form a stable nano fire extinguishing capsule. After curing is completed, the capsules can be separated by centrifugation;

[0026] A4. Drying treatment: Dry the separated nano fire extinguishing capsules to remove residual moisture or solvent;

[0027] A5. Experiment: Test the prepared nano fire extinguishing capsules to determine the performance of the nano fire extinguishing capsules.

[0028] As a further aspect of the present invention: the temperature in A2 is 50 - 80 °C, the stirring speed is 300 - 900 r / min, and the stirring time is not less than 30 min.

[0029] As a further aspect of the present invention: In A3, two methods of heat curing and cold curing can be adopted. The temperature of heat curing is 60 - 100 °C, and after maintaining heat curing for 10 min, it is cooled to room temperature. The temperature of cold curing is 0 - 4 °C.

[0030] As a further aspect of the present invention: When separating in A3, a centrifuge is used, and its rotation speed is 5000 - 8000 r / min.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: The fire extinguishing capsule of the present invention is composed of heat-conducting powder, vinyl silicone oil, platinum catalyst, hydrogen-containing silicone oil, 50U release film, black color paste, inhibitor and nano fire extinguishing capsule shell. The material is more refined and the use effect is more stable, with the functions of fire prevention, fire extinguishing and rescue integrated;

[0032] The nano fire extinguishing capsule can quickly extinguish different types of fires, especially in places prone to fires such as buildings and underground garages, which has great effects;

[0033] The nano fire extinguishing capsule is filled with a nano material with high temperature resistance and heat insulation effect. It can well absorb and transfer the heat energy in the fire, effectively reducing the speed of the fire spreading. When the nano fire extinguishing capsule is put into the fire source, the internal nano material will be released and chemically react with the oxygen in the fire, so that the fire situation can be controlled and finally extinguished. Specific embodiments

[0034] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0035] In the embodiments of the present invention, a nano fire extinguishing capsule, the fire extinguishing capsule is composed of the following components by mass percentage: 50% of heat-conducting powder, 15% of vinyl silicone oil, 1% of platinum catalyst, 2% of hydrogen-containing silicone oil, 0.7% of 50U release film, 1% of black color paste, 0.3% of inhibitor and 30% of nano fire extinguishing capsule shell.

[0036] Specifically, the nano fire extinguishing capsule shell of the present invention is a heat-conducting silica gel sheet. The heat-conducting silica gel sheet uses silicone resin as the raw material and insulating heat-conducting filler, plasticizer, colorant, cross-linking agent and catalyst as auxiliary materials. The production process of the heat-conducting silica gel sheet mainly includes

[0037] S1. Raw material preparation: Select silicone resin with good stability and heat-conducting performance, and prepare the auxiliary materials for preparing the heat-conducting silica gel sheet;

[0038] S2. Plasticizing / mixing: Mix the raw materials prepared in S1 in a certain proportion and carry out high-speed stirring in a mechanical stirrer to make the raw materials evenly dispersed, and through heating and mechanical shearing, plasticize the mixed silica gel material to obtain a plasticized silica gel with a certain fluidity;

[0039] S3. Molding and vulcanization: Inject the plasticized silicone material into a mold, and form a thermally conductive silicone sheet with specific shape and size through the pressing action of the mold. Then, perform vulcanization treatment on the formed thermally conductive silicone sheet to realize the preparation of the nanometer fire extinguishing capsule shell.

[0040] Specifically, the insulating and thermally conductive filler is one or more of alumina, magnesia, boron nitride, aluminum nitride, and quartz.

[0041] Specifically, the plasticizer is dimethyl silicone oil or polyester plasticizer;

[0042] The colorant is silicone oil or phosphate ester;

[0043] The crosslinking agent is titanium oxide;

[0044] The catalyst is neodymium oxide or samarium oxide.

[0045] Specifically, the preparation method of the nanometer fire extinguishing capsule is as follows:

[0046] A1. Raw material preparation: First, accurately weigh raw materials such as thermally conductive powder, vinyl silicone oil, platinum catalyst, hydrogen-containing silicone oil, 50U release film, black color paste, and inhibitor, and prepare the nanometer fire extinguishing capsule shell material.

[0047] A2. Mixing and stirring: Add raw materials such as thermally conductive powder, vinyl silicone oil, platinum catalyst, and hydrogen-containing silicone oil into a reaction kettle according to a certain ratio, and start the stirrer to stir at a certain temperature to make the raw materials evenly mixed;

[0048] A21: After mixing evenly, slowly add the inhibitor and black color paste and continue to stir to make them evenly dispersed in the mixture;

[0049] A22: Finally, add the nanometer fire extinguishing capsule shell so that the shell evenly coats the surface of the mixture to form a nanocapsule;

[0050] A3. Curing and molding: By adjusting conditions such as temperature and pressure, make the shell material cure to form a stable nanometer fire extinguishing capsule. After curing, the capsules can be separated by centrifugation;

[0051] A4. Drying treatment: Dry the separated nanometer fire extinguishing capsules to remove residual moisture or solvent;

[0052] A5. Experiment: Test the prepared nanometer fire extinguishing capsules to determine the performance of the nanometer fire extinguishing capsules.

[0053] Specifically, in A2, the temperature is 50 - 80 °C, the stirring speed is 300 - 900 r / min, and the stirring time is not less than 30 min.

[0054] Specifically for the present invention, in A3, two curing methods, i.e., heat curing and cold curing, can be adopted. The temperature for heat curing is 60 - 100 °C, and after maintaining heat curing for 10 minutes, it is cooled to room temperature. The temperature for cold curing is 0 - 4 °C. When separating A3, a centrifuge is used with a rotation speed of 5000 - 8000 r / min.

[0055] Specifically for the present invention, when drying the nano - fire - extinguishing capsules in A4, they are placed in a drying oven, and a desiccant is added to the drying oven. The temperature inside the drying oven is 25 - 60 °C.

[0056] The following Table 1 shows the main components of the nano - fire - extinguishing capsules of the present invention:

[0057] Table 1:

[0058]

[0059]

[0060] And a Chinese patent "A Micro - Nano Fire - Extinguishing Capsule and Preparation Method" (Publication No. CN107376185A) is selected as Comparative Example 1.

[0061] A Chinese patent "A Nano - Capsule Fire - Extinguishing Material and Its Preparation Method" (Publication No. CN117442920A) is selected as Comparative Example 2.

[0062] The nano - capsule fire - extinguishing materials of Example 1 and Comparative Examples 1 - 2 are subjected to performance tests. The test method refers to the current relevant national standards in China. Among them, 300 mL of isopropanol, 300 g of charcoal, and 300 g of paper - making fiber form different fire sources. The fire - extinguishing effect is compared between 15 g of the fire - extinguishing capsules of the present invention and Comparative Documents 1 - 2. The test results are shown in Table 2 below.

[0063] Table 2:

[0064] Fire source type The fire extinguishing capsule of the present invention The fire extinguishing capsule of Comparative Document 1 The fire extinguishing capsule of Comparative Document 2 300 mL of isopropyl alcohol Can extinguish Cannot extinguish Cannot extinguish 300 g of charcoal Can extinguish Cannot extinguish Can extinguish 300 g of papermaking fiber Can extinguish Can extinguish Can extinguish

[0065] It can be seen from Table 2 above that the fire - extinguishing capsules of the present invention can extinguish 300 mL of isopropanol, 300 g of charcoal, and 300 g of paper - making fiber compared with Comparative Document 1 and Comparative Document 2, achieving a better fire - extinguishing effect. Moreover, the nano - fire - extinguishing capsules of the present invention are filled with a nano - material with high - temperature resistance and heat - insulation effect inside. It can well absorb and transfer the heat energy in the fire, effectively reducing the speed of fire spread. When the nano - fire - extinguishing capsules are put into the fire source, the nano - material inside will be released, react chemically with the oxygen in the fire, control the fire situation, and finally extinguish the fire.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0067] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nano fire extinguishing capsule, characterized in that: The fire extinguishing capsule is composed of the following components in percentage by mass: 50% thermal conductive powder, 15% vinyl silicone oil, 1% platinum catalyst, 2% hydrogen-containing silicone oil, 0.7% 50U release film, 1% black color paste, 0.3% inhibitor and 30% nano fire extinguishing capsule shell.

2. A nano fire extinguishing capsule according to claim 1, characterized in that: The shell of the nano fire extinguishing capsule is a thermally conductive silicone sheet, which is made of silicone resin as raw material and insulating thermally conductive filler, plasticizer, colorant, cross-linking agent and catalyst as auxiliary materials. The production process of the thermally conductive silicone sheet mainly includes: S1. Raw material preparation: Select silicone resin with good stability and thermal conductivity, and prepare auxiliary materials for making thermal conductive silicone sheets; S2, plasticizing / mixing: the raw materials prepared in S1 are mixed in a certain proportion, and stirred at high speed in a mechanical stirrer to make the raw materials evenly dispersed, and the mixed silicone material is plasticized by heating and mechanical shearing to obtain plasticized silicone with a certain fluidity; S3, molding and vulcanization: the plasticized silicone material is injected into the mold, and a thermally conductive silicone sheet with a specific shape and size is formed by the pressing action of the mold, and the molded thermally conductive silicone sheet is vulcanized to realize the preparation of the nano fire extinguishing capsule shell.

3. A nano fire extinguishing capsule according to claim 2, characterized in that: The insulating thermal conductive filler is one or more of aluminum oxide, magnesium oxide, boron nitride, aluminum nitride and quartz.

4. A nano fire extinguishing capsule according to claim 2, characterized in that: The plasticizer is dimethyl silicone oil or polyester plasticizer; The colorant is silicone oil or phosphate ester; The cross-linking agent is titanium oxide; The catalyst is neodymium oxide or samarium oxide.

5. A nano fire extinguishing capsule according to any one of claims 1 to 4, characterized in that: The preparation method of the nano fire extinguishing capsule is as follows: A1. Raw material preparation: First, accurately weigh the thermal conductive powder, vinyl silicone oil, platinum catalyst, hydrogen-containing silicone oil, 50U release film, black color paste and inhibitor, and prepare the nano fire extinguishing capsule shell material; A2. Mixing and stirring: Add the raw materials such as thermal conductive powder, vinyl silicone oil, platinum catalyst, hydrogen-containing silicone oil into the reactor in a certain proportion, and start the agitator to stir at a certain temperature to make the raw materials evenly mixed; A21: After mixing evenly, slowly add the inhibitor and black color paste and continue stirring to evenly disperse them in the mixture; A22: Finally, the nano fire extinguishing capsule shell is added so that the shell is evenly coated on the surface of the mixture to form a nano capsule; A3. Curing and molding: By adjusting the temperature, pressure and other conditions, the capsule shell material is cured to form a stable nano fire extinguishing capsule. After the curing is completed, the capsule can be separated by centrifugation; A4. Drying treatment: Dry the separated nano fire extinguishing capsules to remove residual water or solvent; A5. Experiment: The prepared nano fire extinguishing capsules are tested to determine the performance of the nano fire extinguishing capsules.

6. A nano fire extinguishing capsule according to claim 5, characterized in that: The temperature in A2 is 50-80°C, the stirring speed is 300-900r / min, and the stirring time is not less than 30min.

7. A nano fire extinguishing capsule according to claim 5, characterized in that: A3 can adopt two methods: heat curing and cold curing. The temperature of heat curing is 60-100°C, and after heat curing for 10 minutes, it is cooled to room temperature. The temperature of cold curing is 0-4°C.

8. A nano fire extinguishing capsule according to claim 5, characterized in that: The A3 separation is performed using a centrifuge with a rotation speed of 5000-8000 r / min.

9. A nano fire extinguishing capsule according to claim 5, characterized in that: In the A4, when the nano fire extinguishing capsules are dried, they are placed in a drying oven, and desiccant is added into the drying oven. The temperature inside the drying oven is 25-60°C.

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