Fireproof microcapsule fire extinguishing tablet capable of automatically extinguishing fire and preparation method thereof

Abstract

The invention relates to the technical field of fire extinguishing tablets, in particular to a fireproof microcapsule fire extinguishing tablet capable of automatically extinguishing fire and a preparation method thereof. The self-extinguishing fireproof microcapsule fire extinguishing sheet provided by the invention sequentially comprises a smooth layer, a fire extinguishing base layer, a bonding layer and a release layer from bottom to top, the fire extinguishing base layer comprises a fireproof microcapsule, an organic silicon binder A and a filler; the smooth layer is formed by curing an organic silicon binder B; and the bonding layer is formed by curing an acrylic organic silicon bonding agent or an acrylic resin bonding agent. The self-extinguishing fireproof microcapsule fire extinguishing sheet product provided by the invention is simple in structure, convenient to use and wide in applicability, and can be applied to closed or semi-closed spaces of distribution boxes, electric cabinets, electric appliances, new energy sources and the like to realize self-extinguishing performance.

Description

Technical Field

[0001] The present application relates to the technical field of fire extinguishing tablets, and particularly relates to an automatic fire extinguishing fireproof microcapsule fire extinguishing tablet and a preparation method thereof. Background Art

[0002] The fireproof microcapsule automatic fire extinguisher is a new product for fire prevention and extinguishing. It reacts to heat energy during a fire and is a new type of fire extinguishing product specifically used for extinguishing small-space fires such as control boxes, vaults, switchboards, distribution boards, and power sockets. The fireproof microcapsule fire extinguishing tablet is one of the most widely used products at present. Patent KP102399937B1 provides an active fire extinguishing foamed silica gel sheet, which is prepared by mixing perfluoroketone microcapsules with liquid foamed silica gel in a molding manner, with a foaming temperature of 100-200°C and a pressure of 0.1-0.6 MPa. This method has a relatively complex process, and the relatively high temperature and pressure can cause capsule damage.

[0003] Based on the above analysis, it is very necessary to provide a fire extinguishing tablet that does not require a high-temperature and high-pressure environment. Summary of the Invention

[0004] The embodiments of the present application provide an automatic fire extinguishing fireproof microcapsule fire extinguishing tablet to solve the problem that the preparation of fire extinguishing tablets in related technologies requires a high-temperature and high-pressure environment.

[0005] In a first aspect, the present application provides an automatic fire extinguishing fireproof microcapsule fire extinguishing tablet, which sequentially includes a smooth layer, a fire extinguishing base layer, a bonding layer, and a release layer from bottom to top; the fire extinguishing base layer includes fireproof microcapsules, silicone binder A, and fillers; the smooth layer is formed by curing silicone binder B; the bonding layer is formed by curing acrylic silicone binder or acrylic resin binder.

[0006] In some embodiments, the core material of the fireproof microcapsules is a perfluorinated fire extinguishing agent, and the shell material is a melamine resin containing an active modifier; the active modifier is at least one of vinyl monomers or polymers, acrylic acids, methacrylic acids, acrylate esters, acrylic acid-modified polyurethanes, and acrylic acid-modified silicone resins.

[0007] In some embodiments, the perfluorinated fire extinguishing agent is one or a mixture of perfluoroketone, perfluorotriethylamine, tetrafluorodibromoethane, difluoromonochlorobromomethane, difluorodichloroethane, difluorotrichloroethane, 2-iodoheptafluoropropane, 1-iodoheptafluoropropane, and trifluorotrichloroethane.

[0008] In some embodiments, the raw material compositions of the silicone binder A and the silicone binder B may be the same or different.

[0009] In some embodiments, by mass parts, the silicone binder A or silicone binder B comprises the following raw materials: 50 to 100 parts of vinyl silicone oil, 1 to 10 parts of hydrogen-containing silicone oil, 0.1 to 0.5 parts of platinum catalyst, and 0.01 to 0.05 parts of inhibitor.

[0010] In some embodiments, the filler is at least one of sodium bicarbonate, potassium sulfate, potassium nitrate, potassium nitrite, sodium nitrate, ammonium nitrate, ammonium perchlorate, magnesium carbonate, or ammonium phosphate.

[0011] In some embodiments, by mass percentage, the addition amounts of the fireproof microcapsules, silicone binder A, and filler in the fire extinguishing base layer are 50 to 70%, 20 to 45%, and 5 to 10% respectively.

[0012] In some embodiments, the molecular weight of the vinyl silicone oil is 5000 to 500000.

[0013] In some preferred embodiments, the molecular weight of the vinyl silicone oil is 5000, 10000, 50000, 100000, 200000, or 500000.

[0014] In some embodiments, the Si-H content of the hydrogen-containing silicone oil is 0.1% to 1%.

[0015] In some preferred embodiments, the Si-H content of the hydrogen-containing silicone oil is 0.1%, 0.3%, 0.5%, 0.8%, or 1%.

[0016] In some embodiments, the thickness of the fire extinguishing base layer is 0.5 to 5 cm.

[0017] In some embodiments, the thickness of the smooth layer is 5 to 20 μm.

[0018] In some embodiments, the thickness of the bonding layer is 2 to 10 μm.

[0019] In some embodiments, the thickness of the release layer is 0.1 to 0.5 mm.

[0020] In some embodiments, the fire extinguishing base layer is prepared by a planetary mixer and a calender.

[0021] In some embodiments, the acrylic resin binder is selected from any one or a mixture of methacrylic acid, methyl methacrylate, or methacrylic acid oligomers.

[0022] In some embodiments, the release paper is wood pulp release paper (W01, W03, W05, W07, W10), sized paper (T10, T12, T15, T20, T25, T30), oil-sized paper (O12, O20, O25, O30, O40) or non-sized paper (N20, N25, N30, N40).

[0023] In a second aspect, the present application also provides a method for preparing the above-mentioned fire-extinguishing microcapsule fire-extinguishing tablets for automatic fire extinguishing, comprising the following steps:

[0024] Step S101: Weigh fire-extinguishing microcapsules, silicone binder A and filler, stir, and roll using a calender to obtain a fire-extinguishing base layer;

[0025] Step S102: Cure silicone binder B to obtain a smooth layer;

[0026] Step S103: Cure acrylic silicone binder or acrylic resin binder to obtain a bonding layer;

[0027] Step S104: Coat the smooth layer on the surface of the fire-extinguishing base layer using a layer-by-layer coating technique, coat the bonding layer below the fire-extinguishing base layer using a coating technique, and bond the release layer to the bonding layer to obtain the fire-extinguishing tablet product.

[0028] In some embodiments, the fire-extinguishing microcapsules are prepared through the following process:

[0029] Step S201: Mix melamine and aqueous formaldehyde solution, add triethanolamine to adjust the pH value, heat in a water bath, and stir to obtain a shell pre-polymer;

[0030] Step S202: Add citric acid to the styrene-maleic anhydride solution to adjust the pH, then add sodium perfluorononyloxybenzenesulfonate, and stir to disperse evenly to obtain an emulsifier solution;

[0031] Step S203: Add perfluorinated fire extinguishing agent to the emulsifier solution and disperse to obtain a mixed emulsion;

[0032] Step S204: Add the shell pre-polymer to the mixed emulsion, add citric acid to adjust the pH value, and then add an active modifier for reaction to obtain a microcapsule emulsion;

[0033] Step S205: Sieve the microcapsule emulsion and dry it to obtain the fire-extinguishing microcapsules.

[0034] In some embodiments, in step S201, triethanolamine is added to adjust the pH value to 8-9, and the temperature of the water bath heating is 70-90°C; in step S202, citric acid is added to adjust the pH value to 4-5.

[0035] In some embodiments, in step S204, citric acid is added to adjust the pH value to 4-5; in step S205, the drying temperature is 40-50°C.

[0036] In some embodiments, the shape of the fire extinguishing sheet is rectangular, circular, polygonal, or their deformations.

[0037] The beneficial effects brought by the technical solution provided by this application include:

[0038] The automatic fire extinguishing fireproof microcapsule fire extinguishing sheet product provided by this application has a simple structure, is easy to use, and has a wide applicability. This product can be applied in enclosed or semi-enclosed spaces such as distribution boxes, electrical cabinets, electrical appliances, and new energy to achieve autonomous fire extinguishing performance; when using the fire extinguishing sheet, only the release layer needs to be peeled off to expose the adhesive layer with good adhesive performance, and then it is pasted on the top of the box prone to fire. When a fire occurs, the fire extinguishing sheet is heated, and the internal capsules rupture, releasing fire extinguishing agents such as perfluorohexanone to achieve autonomous fire extinguishing.

[0039] The fireproof microcapsules used in this application have a large number of active vinyl groups on the surface. When added to the silicone binder, under the action of a platinum catalyst, the active vinyl groups on the surface of the microcapsules will undergo a hydrosilylation reaction with the hydrogen-containing silicone oil, making the microcapsules have good compatibility with the silicone binder and avoiding problems such as phase separation; the microcapsules have good chemical binding properties with the glue, which can effectively improve the fire extinguishing performance, mechanical properties, and storage stability of the fire extinguishing sheet. At the same time, it ensures that after the microcapsules are released, the fire extinguishing sheet remains intact and avoids residue splashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic structural diagram of the automatic fire extinguishing fireproof microcapsule fire extinguishing sheet provided by this application.

[0042] Figure 2 It is a schematic diagram of the combination of the fireproof microcapsules and the silicone binder of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0044] The embodiments of this application provide a fireproof microcapsule fire extinguishing sheet with automatic fire extinguishing function, which can solve the problem that the preparation of fire extinguishing sheets in the prior art requires a high-temperature and high-pressure environment.

[0045] This application provides a fireproof microcapsule fire extinguishing sheet with automatic fire extinguishing function. The fire extinguishing sheet sequentially includes a smooth layer, a fire extinguishing base layer, an adhesive layer, and a release layer from bottom to top; the fire extinguishing base layer includes fireproof microcapsules, silicone binder A, and filler; the smooth layer is formed by curing silicone binder B; the adhesive layer is formed by curing acrylic silicone binder or acrylic resin binder.

[0046] Among them, the fireproof microcapsules are prepared through the following process:

[0047] Add 30 g of melamine and 60 g of 37% formaldehyde aqueous solution by mass concentration into a three-necked flask, add triethanolamine dropwise to adjust the pH to 8 - 9, heat in a water bath to 70 - 90 °C, keep warm and stir for 1.5 h, then discharge to obtain a colorless, clear, and transparent melamine resin prepolymer.

[0048] Dissolve 3 g of styrene-maleic anhydride in water to prepare a 3% styrene-maleic anhydride solution by mass concentration, add citric acid to adjust the pH = 4 - 5, keep the temperature at 30 °C, add 3 g of perfluorononoxybenzenesulfonate, and stir to disperse evenly.

[0049] Add 80 g of perfluoromethyl hexanone to the above emulsion, disperse at high speed for 10 min to obtain a mixed emulsion.

[0050] Add 20 g of melamine resin prepolymer to the mixed emulsion solution, add citric acid to adjust the system pH = 4 - 5, and react for 3 h; then add 20 g of methyl methacrylate and react for another 5 h to obtain a microcapsule emulsion.

[0051] Sieve the microcapsule emulsion and dry it at 40 - 50 °C for 12 h to obtain fireproof microcapsules with a particle size of 60 - 120 μm.

[0052] The fire extinguishing base layer is prepared through the following process: By mass percentage, weigh 50 - 70% fireproof microcapsules, 20 - 45% silicone binder A, and 5 - 10% filler, stir, and use a calender to calender to obtain a fire extinguishing base layer with a thickness of 0.5 - 5 cm. The schematic diagram of the combination of fireproof microcapsules and silicone binder is shown inFigure 2 。

[0053] The smooth layer is prepared through the following process: curing the silicone binder B, thereby obtaining a smooth layer with a thickness of 5 - 20 μm.

[0054] The bonding layer is prepared through the following process: curing the acrylic silicone binder or the acrylic resin binder, obtaining a bonding layer with a thickness of 2 - 10 μm.

[0055] Wherein, by mass parts, the silicone binder A or the silicone binder B comprises the following raw materials: 50 - 100 parts of vinyl silicone oil, 1 - 10 parts of hydrogen-containing silicone oil, 0.1 - 0.5 parts of platinum catalyst, and 0.01 - 0.05 parts of inhibitor; mixing the vinyl silicone oil, the hydrogen-containing silicone oil, the platinum catalyst, and the inhibitor, and stirring, thereby obtaining the silicone binder A or the silicone binder B.

[0056] The automatic fire-extinguishing fireproof microcapsule fire extinguishing sheet provided by the present application will be described in detail below in combination with examples and comparative examples.

[0057] Example 1:

[0058] Preparing fireproof microcapsules:

[0059] Adding 30 g of melamine and 60 g of 37% formaldehyde aqueous solution by mass concentration into a three-necked flask, adding triethanolamine dropwise to adjust the pH to 8.5, heating in a water bath to 85 °C, keeping warm and stirring for 1.5 h and then discharging, obtaining a colorless, clear and transparent melamine resin prepolymer;

[0060] Dissolving 3 g of styrene-maleic anhydride in water to prepare a 3% styrene-maleic anhydride solution by mass concentration, adding citric acid to adjust the pH = 4.5, keeping the temperature at 30 °C, adding 3 g of perfluorononoxybenzenesulfonate, and stirring to disperse evenly;

[0061] Adding 80 g of perfluoropentanone into the above emulsion, dispersing at high speed for 10 min, obtaining a mixed emulsion;

[0062] Adding 20 g of melamine resin prepolymer into the mixed emulsion solution, adding citric acid to adjust the system pH = 4, reacting for 3 h; then adding 20 g of methyl methacrylate, and reacting for another 5 h, obtaining a microcapsule emulsion;

[0063] Sieving the microcapsule emulsion, drying at 40 °C for 12 h, obtaining fireproof microcapsules with a particle size of 80 μm.

[0064] Preparing silicone binder A: By mass parts, mixing 60 parts of vinyl silicone oil with a molecular weight of 10,000, 3 parts of hydrogen-containing silicone oil with an Si-H content of 0.5%, 0.3 parts of platinum catalyst, and 0.02 parts of acetylene inhibitor, and stirring evenly at room temperature, obtaining silicone binder A.

[0065] Preparation of silicone binder B: By mass, 80 parts of vinyl silicone oil with a molecular weight of 10,000, 6 parts of hydrogen-containing silicone oil with a Si-H content of 0.5%, 0.4 part of platinum catalyst, and 0.03 part of acetylene inhibitor are mixed and stirred to obtain silicone binder B.

[0066] Preparation of fire-extinguishing base layer: By mass percentage, 60% fireproof microcapsules, 32% silicone binder A, and 8% sodium bicarbonate are mixed and stirred, and then rolled using a calender to obtain the fire-extinguishing base layer;

[0067] Preparation of smooth layer: The silicone binder B is cured at 60 °C to obtain the smooth layer;

[0068] Preparation of bonding layer: The acrylic silicone binder is cured at 60 °C to obtain the bonding layer;

[0069] Using the layer-by-layer coating technique, a smooth layer with a thickness of 8 μm is coated on the surface of the fire-extinguishing base layer with a thickness of 1.5 cm. Using the coating technique, a bonding layer with a thickness of 6 μm is coated below the fire-extinguishing base layer, and the wood pulp release paper W05 is bonded to the bonding layer to obtain the fire-extinguishing sheet product.

[0070] Testing of fire extinguishing agent release amount: The prepared fire-extinguishing sheet product is placed in an oven at 60 °C, kept warm for 24 h, taken out to test the mass, and the percentage of mass loss is calculated, which is the release amount of the fire extinguishing agent. The results show that the release amount of the fire extinguishing agent of the fire-extinguishing sheet prepared in Example 1 is 0.75%.

[0071] Fire extinguishing experiment: Simulating the usage scenario of the fire-extinguishing sheet product, the size of the fire extinguishing box is 0.3 * 0.3 * 0.4 m. A combustion basin is placed at the bottom of the box body, and a combustible liquid (ethanol, gasoline, or n-heptane) is added to the basin. The release layer is removed and the fire-extinguishing sheet is pasted on the top of the box body. The fire basin is ignited, and the fire source is extinguished within 10 s. Repeat 5 times, and the fire extinguishing time is all < 10 s.

[0072] Example 2:

[0073] Preparation of fireproof microcapsules: The preparation process is the same as that in Example 1.

[0074] Preparation of silicone binder A: By mass, 55 parts of vinyl silicone oil with a molecular weight of 15,000, 4 parts of hydrogen-containing silicone oil with a Si-H content of 0.8%, 0.2 part of platinum catalyst, and 0.03 part of acetylene inhibitor are mixed and stirred evenly at room temperature to obtain silicone binder A.

[0075] Preparation of silicone binder B: By mass, 60 parts of vinyl silicone oil with a molecular weight of 10,000, 5 parts of hydrogen-containing silicone oil with a Si-H content of 0.5%, 0.4 part of platinum catalyst, and 0.02 part of acetylene inhibitor are mixed and stirred to obtain silicone binder B.

[0076] Prepare the fire - extinguishing base layer: Mix 55% fire - proof micro - capsules, 40% silicone binder A and 5% potassium nitrate by mass percentage, stir, and roll using a rolling mill to obtain the fire - extinguishing base layer;

[0077] Prepare the smooth layer: Cure silicone binder B at 60 °C to obtain the smooth layer;

[0078] Prepare the bonding layer: Cure the methacrylic resin binder at 60 °C to obtain the bonding layer;

[0079] Use the layer - by - layer coating technique to coat a 6 - μm - thick smooth layer on the surface of a 2.5 - cm - thick fire - extinguishing base layer. Use the coating technique to coat a 5 - μm - thick bonding layer below the fire - extinguishing base layer, and bond the wood pulp release paper W05 to the bonding layer to obtain the fire - extinguishing sheet product.

[0080] Conduct the fire - extinguishing agent release amount test according to the method of Example 1: The results show that the fire - extinguishing agent release amount of the fire - extinguishing sheet prepared in Example 2 is 1.1%.

[0081] Conduct a fire - extinguishing experiment on the fire - extinguishing sheet according to the method of Example 1. The fire source is extinguished within 10 s. Repeat 5 times, and the fire - extinguishing time is all < 10 s.

[0082] Example 3:

[0083] Prepare the fire - proof micro - capsules: The preparation process is the same as that in Example 1.

[0084] Prepare silicone binder A: Mix 80 parts of vinyl silicone oil with a molecular weight of 50000, 6 parts of hydrogen - containing silicone oil with an Si - H content of 0.8%, 0.4 parts of platinum catalyst, and 0.04 parts of acetylene inhibitor by mass, and stir evenly at room temperature to obtain silicone binder A.

[0085] Prepare silicone binder B: Mix 80 parts of vinyl silicone oil with a molecular weight of 30000, 6 parts of hydrogen - containing silicone oil with an Si - H content of 0.5%, 0.4 parts of platinum catalyst, and 0.04 parts of acetylene inhibitor by mass, and stir to obtain silicone binder B.

[0086] Prepare the fire - extinguishing base layer: Weigh 65% fire - proof micro - capsules, 28% silicone binder A, and 7% sodium nitrate by mass percentage, stir, and roll using a rolling mill to obtain the fire - extinguishing base layer.

[0087] Prepare the smooth layer: Cure silicone binder B at 60 °C to obtain the smooth layer.

[0088] Prepare the bonding layer: Cure the acrylic silicone binder at 60 °C to obtain the bonding layer.

[0089] The smooth layer with a thickness of 12 μm was coated on the surface of the fire extinguishing base layer with a thickness of 3 cm by using the layer-by-layer coating technology. The adhesive layer with a thickness of 8 μm was coated under the fire extinguishing base layer by using the coating technology. The wood pulp release paper W05 was bonded to the adhesive layer, and thus the fire extinguishing sheet product was obtained.

[0090] The fire extinguishing agent release amount test was carried out according to the method of Example 1: The results showed that the fire extinguishing agent release amount of the fire extinguishing sheet prepared in Example 3 was 0.92%. The fire extinguishing experiment was carried out on the fire extinguishing sheet according to the method of Example 1. The fire source was extinguished within 10 s, and it was repeated 5 times, and the fire extinguishing time was all < 10 s.

[0091] Comparative Example 1:

[0092] Preparation of fireproof microcapsules:

[0093] 30 g of melamine and 60 g of formaldehyde aqueous solution with a mass concentration of 37% were added into a three-necked flask. Triethanolamine was added dropwise to adjust the pH to 8.5, and the mixture was heated in a water bath to 85 °C. After heat preservation and stirring for 1.5 h, the product was discharged to obtain a colorless, clear and transparent melamine resin prepolymer;

[0094] 3 g of styrene-maleic anhydride was dissolved in water to prepare a styrene-maleic anhydride solution with a mass concentration of 3%. Citric acid was added to adjust the pH = 4.5, and the temperature was kept at 30 °C. 3 g of perfluorononoxybenzenesulfonate was added and stirred until evenly dispersed;

[0095] 80 g of perfluorohexanone was added to the above emulsion and dispersed at high speed for 10 min to obtain a mixed emulsion;

[0096] 20 g of melamine resin prepolymer was added to the mixed emulsion solution, and citric acid was added to adjust the pH of the system to 4. The reaction was carried out for 3 h to obtain a microcapsule emulsion;

[0097] The microcapsule emulsion was sieved and dried at 40 °C for 12 h to obtain fireproof microcapsules with a particle size of 80 μm.

[0098] Preparation of silicone binder A: By mass, 60 parts of vinyl silicone oil with a molecular weight of 10000, 3 parts of hydrogen-containing silicone oil with a Si-H content of 0.5%, 0.3 parts of platinum catalyst and 0.02 parts of acetylene inhibitor were mixed and stirred evenly at room temperature to obtain silicone binder A.

[0099] Preparation of silicone binder B: By mass, 80 parts of vinyl silicone oil with a molecular weight of 10000, 6 parts of hydrogen-containing silicone oil with a Si-H content of 0.5%, 0.4 parts of platinum catalyst and 0.03 parts of acetylene inhibitor were mixed and stirred to obtain silicone binder B.

[0100] Preparing the fire extinguishing base layer: By mass percentage, mix 55% fireproof microcapsules (Note: The applicant found during the experiment that if more than 55% of fireproof microcapsules are added, the effect of forming a sheet will be affected), 40% silicone binder A and 5% sodium bicarbonate, stir, and roll using a calender to obtain the fire extinguishing base layer;

[0101] Preparing the smooth layer: Cure silicone binder B at 60 °C to obtain the smooth layer;

[0102] Preparing the bonding layer: Cure the acrylic silicone binder at 60 °C to obtain the bonding layer;

[0103] Using the layer-by-layer coating technology, coat the smooth layer with a thickness of 8 μm on the surface of the fire extinguishing base layer with a thickness of 1.5 cm. Using the coating technology, coat the bonding layer with a thickness of 6 μm below the fire extinguishing base layer, and bond the wood pulp release paper W05 to the bonding layer to obtain the fire extinguishing sheet product.

[0104] Conduct the fire extinguishing agent release amount test according to the method of Example 1: The results show that the fire extinguishing agent release amount of the fire extinguishing sheet prepared in Comparative Example 1 is 4.7%.

[0105] Conduct the fire extinguishing experiment on the fire extinguishing sheet according to the method of Example 1. The fire source is extinguished within 12 s. Repeat 5 times, and the fire extinguishing time is all < 12 s.

[0106] It can be seen from the results of Example 1 and Comparative Example 1 that using microcapsules without adding a modified active agent has a relatively small impact on the fire extinguishing time, but the fire extinguishing agent release amount of the prepared fire extinguishing sheet is relatively high, indicating that the storage stability of this fire extinguishing sheet is poor. In addition, the applicant found that if more than 55% of fireproof microcapsules are added, the effect of forming a sheet will be affected. The applicant analyzed that this is because the fireproof microcapsules added with a modified active agent contain a large number of active vinyl groups on the surface. When added to the silicone binder, under the action of a platinum catalyst, the active vinyl groups on the surface of the microcapsules will undergo a hydrosilylation reaction with the hydrogen-containing silicone oil, making the microcapsules have good compatibility with the silicone binder, thereby effectively improving the storage stability of the fire extinguishing sheet; while the fireproof microcapsules without adding a modified active agent lack active groups on the surface and have poor compatibility with the silicone binder, and the addition amount cannot be too high, otherwise the effect of forming a sheet will be affected.

[0107] In the description of this specification, the descriptions referring to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example" or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0108] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element. In this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0109] The above are only specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An automatic fire extinguishing fireproof microcapsule fire extinguishing tablet, characterized in that The fire extinguishing sheet sequentially includes a smooth layer, a fire extinguishing base layer, an adhesive layer, and a release layer from bottom to top; the fire extinguishing base layer includes fireproof microcapsules, silicone binder A, and a filler; the smooth layer is formed by curing silicone binder B; the adhesive layer is formed by curing an acrylic silicone binder or an acrylic resin binder.

2. The automatic fire extinguishing fireproof microcapsule fire extinguishing tablet according to claim 1, characterized in that, The core material of the fireproof microcapsules is a perfluorinated fire extinguishing agent, and the shell material is a melamine resin containing an active modifier; the active modifier is at least one of vinyl monomers or polymers, acrylic acids, methacrylic acids, acrylic esters, acrylic acid-modified polyurethanes, and acrylic acid-modified silicone resins.

3. The fire-proof microcapsule fire-extinguishing tablet according to claim 1, characterized in that: The raw material compositions of silicone binder A and silicone binder B can be the same or different.

4. The automatic fire-extinguishing fireproof microcapsule fire-extinguishing tablet according to claim 1, wherein By mass, silicone binder A or silicone binder B includes the following raw materials: 50 to 100 parts of vinyl silicone oil, 1 to 10 parts of hydrogen-containing silicone oil, 0.1 to 0.5 parts of a platinum catalyst, and 0.01 to 0.05 parts of an inhibitor.

5. The automatic fire extinguishing fireproof microcapsule fire extinguishing tablet according to claim 1, characterized in that, The filler is at least one of sodium bicarbonate, potassium sulfate, potassium nitrate, potassium nitrite, sodium nitrate, ammonium nitrate, ammonium perchlorate, magnesium carbonate, or ammonium phosphate.

6. The automatic fire-extinguishing fireproof microcapsule fire-extinguishing tablet according to claim 1, wherein By mass percentage, the addition amounts of the fireproof microcapsules, silicone binder A, and the filler in the fire extinguishing base layer are 50 to 70%, 20 to 45%, and 5 to 10% respectively.

7. The fire-proof microcapsule fire-extinguishing tablet according to claim 1, characterized in that: The thickness of the fire extinguishing base layer is 0.5 to 5 cm; the thickness of the smooth layer is 5 to 20 μm; the thickness of the adhesive layer is 2 to 10 μm; the thickness of the release layer is 0.1 to 0.5 mm.

8. The fire extinguishing fireproof microcapsule fire extinguishing tablet according to claim 1, characterized in that, The acrylic resin binder is selected from any one or a mixture of methacrylic acid, methyl methacrylate, or a methacrylic acid oligomer.

9. The method for preparing the fire-proof microcapsule fire-extinguishing tablet with automatic fire extinguishing function according to any one of claims 1 to 8, characterized in that: It includes the following steps: Weigh the fireproof microcapsules, silicone binder A, and the filler, stir, and roll them using a calender to obtain the fire extinguishing base layer; Cure silicone binder B to obtain the smooth layer; Cure the acrylic silicone binder or the acrylic resin binder to obtain the adhesive layer; Coat the smooth layer on the surface of the fire extinguishing base layer using a lamination coating technique, coat the adhesive layer below the fire extinguishing base layer using a coating technique, and bond the release layer to the adhesive layer to obtain the fire extinguishing sheet product.

10. The preparation method of the fire extinguishing fireproof microcapsule fire extinguishing sheet according to claim 9, characterized in that, The fireproof microcapsules are prepared through the following process: Mix melamine and an aqueous formaldehyde solution, add triethanolamine to adjust the pH value, heat in a water bath, and stir to obtain a shell material prepolymer; Add citric acid to a styrene-maleic anhydride solution to adjust the pH, then add sodium perfluorononoxybenzenesulfonate, and stir and disperse evenly to obtain an emulsifier solution; Add the perfluorinated fire extinguishing agent to the emulsifier solution and disperse to obtain a mixed emulsion; Add the shell material prepolymer to the mixed emulsion, add citric acid to adjust the pH value, and then add the active modifier to react to obtain a microcapsule emulsion; Sieve the microcapsule emulsion and dry it to obtain the fireproof microcapsules.

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