Composite material for fire blanket and preparation method thereof

Abstract

The invention discloses a preparation method of a composite material for a fire-fighting blanket and a method thereof, and belongs to the technical field of fire-extinguishing materials. The composite material for the fire-fighting fire blanket is prepared from the following raw materials in parts by weight: 40 to 50 parts of phenolic resin, 20 to 30 parts of acrylic resin, 4 to 8 parts of hexamethylenetetramine, 1 to 3 parts of polyol glycidyl ether, 15 to 20 parts of ammonium polyphosphate, 4 to 10 parts of pentaerythritol, 1 to 2 parts of dispersing agent, 10 to 15 parts of fire extinguishing agent microcapsule, 5 to 10 parts of poly (N-isopropylacrylamide) and 5 to 10 parts of solvent. In addition, the invention further provides a preparation method of the composite material for the fire blanket. The composite material provided by the invention can realize repeated fire extinguishing of the fire blanket.

Description

Technical Field

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

[0002] As a common firefighting equipment, fire blankets are widely used in various fire scenes. They cover the fire source and isolate oxygen to achieve the purpose of fire extinguishing. They are easy to operate and have a wide range of applications. They are often used in homes, shopping malls, hotels, entertainment venues, gas stations, cars, ships and other places.

[0003] At present, most fire blankets are made of textiles such as glass fiber. These materials are prone to deformation, brittleness or even melting when heated. During the fire extinguishing process, the fire blanket is directly exposed to flames and high temperatures, and the fiber structure will be damaged, such as fiber breakage and shedding, resulting in damage to the integrity of the fire blanket. Even if the surface appears intact, the damage to the internal fibers will greatly reduce its thermal insulation and flame retardant properties, making it difficult to effectively extinguish the fire again.

[0004] Some fire blankets use special fire extinguishing methods, such as fire blankets containing fire extinguishing agent microcapsules. However, during the fire extinguishing process, the microcapsules are easily destroyed. Even if the fire is extinguished before the fire extinguishing agent is completely released, the fire extinguishing agent can no longer be retained and can only continue to be released completely, resulting in the fire blanket being unable to be used for fire extinguishing again. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide a composite material for fire extinguishing blanket and a preparation method thereof, and solve the technical problem that the fire blanket containing fire extinguishing agent microcapsules in the prior art is difficult to repeatedly extinguish fires.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides a composite material for fire extinguishing blanket. The raw materials are calculated by weight and include: 40-50 parts of phenolic resin, 20-30 parts of acrylic resin, 4-8 parts of hexamethylenetetramine, 1-3 parts of polyol glycidyl ether, 15-20 parts of ammonium polyphosphate, 4-10 parts of pentaerythritol, 1-2 parts of dispersant, 10-15 parts of fire extinguishing agent microcapsules, 5-10 parts of poly N-isopropylacrylamide and 5-10 parts of solvent.

[0007] In any embodiment, 5-10 parts of epoxy resin microcapsules are further included.

[0008] In any embodiment, 5-10 parts of aluminum hydroxide are also included.

[0009] In any embodiment, the dispersant is polyacrylic acid sodium salt; and / or the solvent is one or two of isopropanol, ethanol and acetone.

[0010] In any embodiment, the fire extinguishing agent microcapsule sequentially includes a first core, a first coating layer, a sodium bicarbonate layer, and a second coating layer from the inside out; the first core includes perfluoromethylcyclohexanone and montmorillonite; the sodium bicarbonate layer includes sodium bicarbonate and montmorillonite; in the first core, the mass ratio of perfluoromethylcyclohexanone to montmorillonite is (4 - 6):1; in the sodium bicarbonate layer, the mass ratio of sodium bicarbonate to montmorillonite is (1 - 2):1.

[0011] In any embodiment, the first coating layer is an epoxy resin coating layer, and the second coating layer is an alginate coating layer.

[0012] In any embodiment, the fire extinguishing agent microcapsule is prepared by the following steps:

[0013] Mix perfluoromethylcyclohexanone and montmorillonite to form a core.

[0014] Dissolve epoxy resin in an organic solvent, add an emulsifier to obtain a solution containing epoxy resin, add the core to the solution containing epoxy resin, and then add a curing agent to obtain a core coated with epoxy resin.

[0015] Mix sodium bicarbonate, montmorillonite, and water to obtain a suspension.

[0016] Add the core coated with epoxy resin to the suspension to obtain microcapsules coated with a sodium bicarbonate layer.

[0017] Mix the microcapsules coated with a sodium bicarbonate layer with an aqueous solution of alginate to obtain the fire extinguishing agent microcapsule.

[0018] In any embodiment, the epoxy resin microcapsule sequentially includes a second core, a third coating layer, and a fourth coating layer from the inside out.

[0019] In any embodiment, the epoxy resin microcapsule is prepared by the following steps:

[0020] Mix epoxy resin, water, and an emulsifier to obtain an epoxy resin solution.

[0021] Drop a polyvinyl alcohol solution into the epoxy resin solution to obtain an emulsion of epoxy resin coated with polyvinyl alcohol.

[0022] Continue to add a phenolic resin prepolymer to the emulsion of epoxy resin that has been coated with polyvinyl alcohol, add an initiator at the same time, and adjust the pH to 8 - 9 and stir to react to obtain the epoxy resin microcapsule.

[0023] In addition, the present invention also provides a method for preparing the above - mentioned composite material for a fire - fighting blanket, including the following steps:

[0024] Phenolic resin and acrylic resin are mixed, and then hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate and pentaerythritol are added and mixed. Then a dispersant and N-isopropylacrylamide are added and mixed. Then microcapsules of fire extinguishing agent are added and mixed. Then a solvent is added and mixed to obtain the composite material.

[0025] Compared with the prior art, the beneficial effects of the present invention include: a three-dimensional network structure with certain toughness and adhesion is formed by the crosslinking of hexamethylenetetramine and polyol glycidyl ether with phenolic resin and acrylic resin. At high temperature, the phenolic resin will decompose and carbonize to form a heat-insulating carbon layer, which also provides a basic skeleton for expansion and deformation. At high temperature, ammonium polyphosphate decomposes to produce phosphoric acid and ammonia gas, which promotes the dehydration and carbonization of pentaerythritol to form an expanded carbon layer for heat insulation and oxygen isolation, further protecting the overall three-dimensional network structure from being damaged. When the microcapsules of fire extinguishing agent are heated, the coating layer on the surface is damaged to release the fire extinguishing agent to achieve fire extinguishing. Poly(N-isopropylacrylamide) (PNIPAM) will become dissolved under the action of the high temperature of fire and combine with the fire extinguishing agent. When the temperature drops below its lower critical solution temperature (about 32°C) after fire extinguishing, PNIPAM will undergo a phase transition, changing from hydrophilic to hydrophobic, and the molecular chains aggregate to coat the fire extinguishing agent, reducing the release amount of the fire extinguishing agent. Thus, when extinguishing fire again, the fire extinguishing agent can be released again, so the repeated fire extinguishing of the fire blanket can be realized. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the microcapsules of fire extinguishing agent in Embodiment 1 of the present invention.

[0027] Description of the reference numerals: 1, the first core; 2, the first coating layer; 3, the sodium bicarbonate layer; 4, the second coating layer; Detailed Embodiments

[0028] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0029] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0030] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0031] The present specific embodiment provides a composite material for fire blanket. The raw materials are calculated by weight and include: 40-50 parts of phenolic resin, 20-30 parts of acrylic resin, 4-8 parts of hexamethylenetetramine, 1-3 parts of polyol glycidyl ether, 15-20 parts of ammonium polyphosphate, 4-10 parts of pentaerythritol, 1-2 parts of dispersant, 10-15 parts of fire extinguishing agent microcapsules, 5-10 parts of poly N-isopropylacrylamide and 5-10 parts of solvent.

[0032] In some embodiments, it further includes 5-10 parts of epoxy resin microcapsules. During fire extinguishing, under the action of high temperature, the epoxy resin microcapsules will delay softening or rupture under the protection of the wall material and slowly release epoxy resin. Epoxy resin has good adhesiveness and will flow to the damaged parts (such as microcracks, holes, etc.) of the coating generated during the fire extinguishing process, fill and repair the damaged parts of the coating, and re-establish the continuity and integrity of the coating. The repaired coating can continue to closely adhere to the fire extinguishing blanket substrate, assisting in the distribution of the fire extinguishing agent and the exertion of the fire extinguishing effect during subsequent fire extinguishing.

[0033] In some embodiments, it further includes 5-10 parts of aluminum hydroxide. When aluminum hydroxide is heated, it will decompose to release water and absorb heat, having a certain temperature-lowering effect, reducing the temperature of the fire extinguishing blanket, which is beneficial to reducing the release amount of the fire extinguishing agent and delaying the release rate of epoxy resin.

[0034] In some embodiments, the dispersant is a sodium polyacrylate salt; the solvent is one or more of isopropyl alcohol, ethanol, and acetone.

[0035] In some embodiments, the fire extinguishing agent microcapsule sequentially includes a first core, a first coating layer, a sodium bicarbonate layer, and a second coating layer from the inside out; the first core includes perfluoromethylcyclohexanone and montmorillonite; the sodium bicarbonate layer includes sodium bicarbonate and montmorillonite; in the first core, the mass ratio of perfluoromethylcyclohexanone to montmorillonite is (4-6):1; in the sodium bicarbonate layer, the mass ratio of sodium bicarbonate to montmorillonite is (1-2):1; the first coating layer is an epoxy resin coating layer, and the second coating layer is a sodium alginate coating layer. Montmorillonite has an adsorption effect on perfluoromethylcyclohexanone, thereby realizing the slow release of perfluoromethylcyclohexanone. The epoxy resin coating layer can separate perfluoromethylcyclohexanone from the outside world. The montmorillonite in the sodium bicarbonate layer adsorbs and coats sodium bicarbonate on the outer layer of perfluoromethylcyclohexanone. The montmorillonite in the sodium bicarbonate layer has a drying effect and can prevent water vapor from entering the core, which is more conducive to the preservation of perfluoromethylcyclohexanone. When heated, the sodium bicarbonate layer preferentially releases carbon dioxide for fire extinguishing. Combining with other components can basically achieve rapid fire extinguishing, allowing most of the perfluoromethylcyclohexanone to be continuously retained and reused for fire extinguishing.

[0036] During fire extinguishing, under the action of high temperature, sodium bicarbonate generates carbon dioxide for fire extinguishing. The epoxy resin coating layer can protect perfluoromethylcyclohexanone and allow it to continuously release perfluoromethylcyclohexanone inside the epoxy resin coating layer to assist in fire extinguishing, largely keeping the fire extinguishing agent in a coated state. After carbon dioxide fire extinguishing, under the action of poly(N-isopropylacrylamide), it can strengthen the coating of the fire extinguishing agent, prevent the continuous release of the fire extinguishing agent, and enable it to extinguish fires repeatedly.

[0037] In some embodiments, the fire extinguishing agent microcapsule is prepared by the following steps:

[0038] Mix perfluoromethylcyclohexanone and montmorillonite to form a core;

[0039] Dissolve epoxy resin in an organic solvent, add an emulsifier to obtain a solution containing epoxy resin, add the core to the solution containing epoxy resin, and then add a curing agent to obtain a core coated with epoxy resin;

[0040] Mix sodium bicarbonate, montmorillonite and water to obtain a suspension;

[0041] Add the core coated with epoxy resin to the suspension to obtain microcapsules coated with a sodium bicarbonate layer;

[0042] Mix the microcapsules coated with a sodium bicarbonate layer with an aqueous solution of sodium alginate to obtain the fire extinguishing agent microcapsules.

[0043] In some embodiments, the epoxy resin microcapsules sequentially include a second core, a third coating layer and a fourth coating layer from the inside out; the epoxy resin microcapsules are prepared by the following steps:

[0044] Mix epoxy resin, water and an emulsifier to obtain an epoxy resin solution;

[0045] Drop the polyvinyl alcohol solution into the epoxy resin solution to obtain an emulsion of epoxy resin coated with polyvinyl alcohol;

[0046] Continue to add the phenolic resin prepolymer to the emulsion of epoxy resin already coated with polyvinyl alcohol, add an initiator at the same time, and adjust the pH to 8-9 and stir to react to obtain the epoxy resin microcapsules. The third coating layer is a polyvinyl alcohol coating layer, and the fourth coating layer is a phenolic resin coating layer. These two coating layers coat the epoxy resin from the inside out, so that the epoxy resin microcapsules have certain high temperature resistance. Under the high temperature during fire extinguishing, the epoxy resin microcapsules can be delayed in softening or destruction, and can flow to the damaged coating position to repair it, so that the overall structure of the coating is not damaged, and thus it is convenient to retain the fire extinguishing effect.

[0047] This specific embodiment also provides a preparation method of the above composite material for a fire fighting blanket, including the following steps:

[0048] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate and pentaerythritol, then add a dispersant and N-isopropylacrylamide, then add fire extinguishing agent microcapsules, and then add a solvent to obtain the composite material.

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] In the present invention, reference is made to “some embodiments”, “this embodiment”, examples, etc., which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0051] If similar descriptions of "first / second" appear in the application documents, the following instructions are added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0052] In this embodiment, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, object A and / or object B may represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0053] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0054] Example 1

[0055] The present embodiment provides a composite material for a fire blanket. The raw materials, calculated by weight, include: 45 parts of phenolic resin, 25 parts of acrylic resin, 6 parts of hexamethylenetetramine, 2 parts of polyol glycidyl ether, 18 parts of ammonium polyphosphate, 8 parts of pentaerythritol, 2 parts of dispersant polyacrylic acid sodium salt, 12 parts of fire extinguishing agent microcapsules, 8 parts of poly N-isopropylacrylamide and 8 parts of solvent ethanol.

[0056] Combination Figure 1, the fire extinguishing agent microcapsule includes, from the inside out, a first core 1, a first coating layer 2, a sodium bicarbonate layer 3, and a second coating layer 4 in sequence; the first core 1 includes perfluoromethylcyclohexanone and montmorillonite; the sodium bicarbonate layer 3 includes sodium bicarbonate and montmorillonite; in the first core 1, the mass ratio of perfluoromethylcyclohexanone to montmorillonite is 4:1; in the sodium bicarbonate layer 3, the mass ratio of sodium bicarbonate to montmorillonite is 1:1; the first coating layer 2 is an epoxy resin coating layer, and the second coating layer 4 is a sodium alginate coating layer.

[0057] The fire extinguishing agent microcapsule is prepared by the following steps:

[0058] Mix 40 g of perfluoromethylcyclohexanone and 10 g of montmorillonite to form a core.

[0059] Dissolve 15 g of epoxy resin in 100 mL of organic solvent toluene, add 5 g of emulsifier Tween-80 to obtain a solution containing epoxy resin, add the core to the solution containing epoxy resin, and then add 8 g of curing agent ethylenediamine to obtain an epoxy resin-coated core.

[0060] Mix 15 g of sodium bicarbonate, 15 g of montmorillonite, and 200 mL of water to obtain a suspension.

[0061] Add the epoxy resin-coated core to the suspension and mix for 30 min to evenly coat a layer of sodium bicarbonate on the surface of the epoxy resin-coated core to obtain a microcapsule coated with a sodium bicarbonate layer.

[0062] Dissolve 10 g of sodium alginate in 150 mL of water and stir until completely dissolved to prepare an aqueous solution of sodium alginate.

[0063] Mix the microcapsule coated with a sodium bicarbonate layer with the aqueous solution of sodium alginate, then filter, wash, and naturally dry at 25 °C to obtain the fire extinguishing agent microcapsule. The particle size of the fire extinguishing agent microcapsule is 50 - 150 μm.

[0064] This embodiment also provides a preparation method of the above composite material for a fire-fighting blanket, including the following steps:

[0065] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate, and pentaerythritol, then add a dispersant and N-isopropylacrylamide, then add the fire extinguishing agent microcapsule, and then add a solvent to obtain the composite material.

[0066] Example 2

[0067] The present embodiment provides a composite material for a fire blanket. The raw materials, calculated by weight, include: 50 parts of phenolic resin, 20 parts of acrylic resin, 8 parts of hexamethylenetetramine, 1 part of polyol glycidyl ether, 15 parts of ammonium polyphosphate, 4 parts of pentaerythritol, 1 part of dispersant polyacrylic acid sodium salt, 10 parts of fire extinguishing agent microcapsules, 10 parts of solvent isopropyl alcohol and 5 parts of poly (N-isopropylacrylamide).

[0068] The fire extinguishing agent microcapsule comprises, from the inside to the outside, a first capsule core, a first coating layer, a sodium bicarbonate layer and a second coating layer; the first capsule core comprises perfluorohexanone and montmorillonite; the sodium bicarbonate layer comprises sodium bicarbonate and montmorillonite; in the first capsule core, the mass ratio of perfluorohexanone to montmorillonite is 5:1; in the sodium bicarbonate layer, the mass ratio of sodium bicarbonate to montmorillonite is 2:1; the first coating layer is an epoxy resin coating layer, and the second coating layer is a sodium alginate coating layer.

[0069] The fire extinguishing agent microcapsules are prepared by the following steps:

[0070] 50 g of perfluorohexanone and 10 g of montmorillonite were mixed to form a capsule core;

[0071] 20 g of epoxy resin was dissolved in 100 mL of organic solvent toluene, and 5 g of emulsifier Tween-80 was added to obtain a solution containing epoxy resin, the capsule core was added to the solution containing epoxy resin, and then 8 g of curing agent ethylenediamine was added to obtain the epoxy resin coated capsule core;

[0072] Mix 30 g of sodium bicarbonate, 15 g of montmorillonite and 200 mL of water to obtain a suspension;

[0073] Adding the epoxy resin coated capsule core to the suspension and mixing for 30 minutes, so that the surface of the epoxy resin coated capsule core is evenly coated with a layer of sodium bicarbonate, to obtain microcapsules coated with a sodium bicarbonate layer;

[0074] Dissolve 10 g of sodium alginate in 150 mL of water and stir until completely dissolved to prepare an aqueous solution of sodium alginate;

[0075] The microcapsules coated with the sodium bicarbonate layer are mixed with an aqueous solution of sodium alginate, and then filtered, washed, and naturally dried at 25° C. to obtain the fire extinguishing agent microcapsules. The particle size of the fire extinguishing agent microcapsules is 50-150 μm.

[0076] This embodiment also provides a method for preparing the composite material for fire blanket, comprising the following steps:

[0077] Phenolic resin and acrylic resin are mixed, and then hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate and pentaerythritol are added and mixed. Then, a dispersant and N-isopropylacrylamide are added and mixed. Then, fire-extinguishing agent microcapsules are added and mixed. Finally, a solvent is added and mixed to obtain the composite material.

[0078] Example 3

[0079] This example provides a composite material for a fire-fighting blanket. Calculated by weight, the raw materials include: 40 parts of phenolic resin, 30 parts of acrylic resin, 4 parts of hexamethylenetetramine, 3 parts of polyol glycidyl ether, 20 parts of ammonium polyphosphate, 10 parts of pentaerythritol, 1 part of dispersant sodium polyacrylate salt, 15 parts of fire-extinguishing agent microcapsules, 5 parts of solvent isopropanol, and 10 parts of poly(N-isopropylacrylamide).

[0080] The fire-extinguishing agent microcapsules successively include a first core, a first coating layer, a sodium bicarbonate layer, and a second coating layer from the inside out; the first core includes perfluoromethyl hexanone and montmorillonite; the sodium bicarbonate layer includes sodium bicarbonate and montmorillonite; in the first core, the mass ratio of perfluoromethyl hexanone to montmorillonite is 6:1; in the sodium bicarbonate layer, the mass ratio of sodium bicarbonate to montmorillonite is 1.5:1; the first coating layer is an epoxy resin coating layer, and the second coating layer is an alginate coating layer.

[0081] The fire-extinguishing agent microcapsules are prepared by the following steps:

[0082] Mix 60 g of perfluoromethyl hexanone and 10 g of montmorillonite to form a core.

[0083] Dissolve 20 g of epoxy resin in 100 mL of organic solvent toluene, and add 5 g of emulsifier Tween-80 to obtain a solution containing epoxy resin. Add the core to the solution containing epoxy resin, and then add 8 g of curing agent ethylenediamine to obtain a core coated with epoxy resin.

[0084] Mix 22.5 g of sodium bicarbonate, 15 g of montmorillonite, and 200 mL of water to obtain a suspension.

[0085] Add the core coated with epoxy resin to the suspension and mix for 30 min to uniformly coat a layer of sodium bicarbonate on the surface of the core coated with epoxy resin, obtaining microcapsules coated with a sodium bicarbonate layer.

[0086] Dissolve 10 g of sodium alginate in 150 mL of water and stir until completely dissolved to prepare an aqueous solution of sodium alginate.

[0087] Mix the microcapsules coated with a sodium bicarbonate layer with the aqueous solution of sodium alginate, then filter, and naturally dry at 25 °C to obtain the fire-extinguishing agent microcapsules. The particle size of the fire-extinguishing agent microcapsules is 50 - 150 μm.

[0088] This embodiment also provides a method for preparing the above-mentioned composite material for a fire-fighting blanket, which includes the following steps:

[0089] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate and pentaerythritol and mix them. Then add a dispersant and N-isopropylacrylamide and mix them. Then add fire-extinguishing agent microcapsules and mix them. Then add a solvent and mix them to obtain the composite material.

[0090] Example 4

[0091] This embodiment provides a composite material for a fire-fighting blanket, which is different from that in Example 1 in that it further includes 8 parts of epoxy resin microcapsules. The epoxy resin microcapsules sequentially include a second core, a third coating layer and a fourth coating layer from the inside out.

[0092] The epoxy resin microcapsules are prepared by the following steps:

[0093] Mix 50 g of epoxy resin, 100 mL of water and 5 g of emulsifier Tween-80 to obtain an emulsion;

[0094] Dissolve 10 g of polyvinyl alcohol in 100 mL of water to obtain a polyvinyl alcohol solution;

[0095] Drop the polyvinyl alcohol solution into the epoxy resin solution to obtain an epoxy resin emulsion coated with polyvinyl alcohol;

[0096] Mix 110 g of phenol, 180 g of formaldehyde with a mass concentration of 37% and 1 g of oxalic acid, stir and heat up to 95 °C and react until the viscosity reaches 700 mPa·s to obtain a phenolic resin prepolymer;

[0097] Continue to add 20 g of the phenolic resin prepolymer to the epoxy resin emulsion that has been coated with polyvinyl alcohol, and at the same time add initiator ammonium persulfate, and adjust the pH to 8 with sodium hydroxide solution and stir and react to obtain the epoxy resin microcapsules. The particle size of the epoxy resin microcapsules is 100 - 150 μm.

[0098] This embodiment also provides a method for preparing the above-mentioned composite material for a fire-fighting blanket, which includes the following steps:

[0099] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate and pentaerythritol and mix them. Then add a dispersant and N-isopropylacrylamide and mix them. Then add fire-extinguishing agent microcapsules and epoxy resin microcapsules and mix them. Then add a solvent and mix them to obtain the composite material.

[0100] Example 5

[0101] This embodiment provides a composite material for a fire-fighting blanket. The difference from Embodiment 2 is that it further includes 5 parts of epoxy resin microcapsules. The preparation steps of the epoxy resin microcapsules and the preparation method of the composite material are the same as those in Embodiment 4.

[0102] Embodiment 6

[0103] This embodiment provides a composite material for a fire-fighting blanket. The difference from Embodiment 3 is that it further includes 10 parts of epoxy resin microcapsules. The preparation steps of the epoxy resin microcapsules and the preparation method of the composite material are the same as those in Embodiment 4.

[0104] Embodiment 7

[0105] This embodiment provides a composite material for a fire-fighting blanket. The difference from Embodiment 1 is that it further includes 8 parts of aluminum hydroxide.

[0106] This embodiment also provides a preparation method of the above composite material for a fire-fighting blanket, including the following steps:

[0107] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate, and pentaerythritol and mix. Then add a dispersant, aluminum hydroxide, and N-isopropylacrylamide and mix. Then add fire extinguishing agent microcapsules and mix. Then add a solvent and mix to obtain the composite material.

[0108] Embodiment 8

[0109] This embodiment provides a composite material for a fire-fighting blanket. The difference from Embodiment 4 is that it further includes 8 parts of aluminum hydroxide.

[0110] This embodiment also provides a preparation method of the above composite material for a fire-fighting blanket, including the following steps:

[0111] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate, and pentaerythritol and mix. Then add a dispersant, aluminum hydroxide, and N-isopropylacrylamide and mix. Then add fire extinguishing agent microcapsules and epoxy resin microcapsules and mix. Then add a solvent and mix to obtain the composite material.

[0112] Comparative Example 1

[0113] The difference between this comparative example and Embodiment 1 is that the fire extinguishing agent microcapsules are different from those in Embodiment 1. The fire extinguishing agent microcapsules in this comparative example do not contain a sodium bicarbonate layer, and other components and dosages are the same as those in Embodiment 1.

[0114] The fire extinguishing agent microcapsules include a first core, a first coating layer, and a second coating layer from the inside out.

[0115] The fire extinguishing agent microcapsules of this comparative example are prepared by the following steps:

[0116] Mix 40 g of perfluorhexanone and 10 g of montmorillonite to form the core;

[0117] Dissolve 15 g of epoxy resin in 100 mL of organic solvent toluene, add 5 g of emulsifier Tween-80 to obtain a solution containing epoxy resin, add the core to the solution containing epoxy resin, and then add 8 g of curing agent ethylenediamine to obtain the core coated with epoxy resin;

[0118] Weigh 10 g of sodium alginate, dissolve it in 150 mL of water, and stir until completely dissolved to make an aqueous solution of sodium alginate;

[0119] Mix the core coated with epoxy resin with the aqueous solution of sodium alginate, then filter, wash, and naturally dry at 25 °C to obtain the fire extinguishing agent microcapsules. The particle size of the fire extinguishing agent microcapsules is 50 - 150 μm.

[0120] Comparative Example 2

[0121] The composite material for the fire-fighting blanket of this comparative example is different from that of Example 1 in that it does not contain N-isopropylacrylamide, and the other components and dosages are the same as those of Example 1.

[0122] This example also provides a preparation method of the above composite material for the fire-fighting blanket, including the following steps:

[0123] Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate, and pentaerythritol, then add a dispersant, then add fire extinguishing agent microcapsules, and then add a solvent to obtain the composite material.

[0124] Comparative Example 3

[0125] The composite material for the fire-fighting blanket of this comparative example is different from that of Example 1 in that the fire extinguishing agent microcapsules are different from those of Example 1. The fire extinguishing agent microcapsules of this comparative example do not contain the first core and the first coating layer, and the other components and dosages are the same as those of Example 1.

[0126] The fire extinguishing agent microcapsules include a sodium bicarbonate layer and a second coating layer from the inside out in sequence.

[0127] The fire extinguishing agent microcapsules of this comparative example are prepared by the following steps:

[0128] Mix 15 g of sodium bicarbonate, 15 g of montmorillonite, and 200 mL of water to obtain a suspension;

[0129] Dissolve 10 g of sodium alginate in 150 mL of water, and stir until completely dissolved to make an aqueous solution of sodium alginate;

[0130] An aqueous solution of sodium alginate was added to the suspension and mixed, and then filtered, washed, and naturally dried at 25°C to obtain the fire extinguishing agent microcapsules of this comparative example. The particle size of the fire extinguishing agent microcapsules is 50 - 150 μm.

[0131] The composite materials of Examples 1 - 4, Examples 7 - 8 and Comparative Examples 1 - 2 were coated on a conventional glass fiber base fabric and placed at room temperature for 24 hours. The composite materials were completely dried to form a fire extinguishing coating. The fire extinguishing coating was closely attached to the glass fiber base fabric, and the thickness of the coating was 3 mm.

[0132] We used 21700 lithium - ion batteries to simulate heating to trigger battery thermal runaway. After the lithium - ion battery caught fire, fire - extinguishing blankets made of the composite materials of Examples 1 - 4, Examples 7 - 8 and Comparative Examples 1 - 3 were used to cover and extinguish the fire. The time required for extinguishing the fire and the effect of suppressing re - ignition are shown in Table 1.

[0133] Table 1

[0134] Time required for fire extinguishing (s) Whether afterflame can be suppressed Example 1 5 Can suppress afterflame Example 2 5 Can suppress afterflame Example 3 5 Can suppress afterflame Example 4 5 Can suppress afterflame Example 7 4 Can suppress afterflame Example 8 4 Can suppress afterflame Comparative Example 1 5 Can suppress afterflame Comparative Example 2 5 Can suppress afterflame Comparative Example 3 5 Can suppress afterflame

[0135] As can be seen from Table 1, the composite materials of Examples 1 - 4, Examples 7 - 8 and Comparative Examples 1 - 3 all have excellent fire - extinguishing effects. The above - mentioned fire - extinguishing experiment was repeated 2 times on the fire - extinguished carpet. After each fire - extinguishing, the carpet was quickly cooled to below 30°C in a refrigerator at 0°C. The results are shown in Table 2.

[0136] Table 2

[0137]

[0138] / indicates that no relevant test results were obtained.

[0139] As can be seen from Table 2, Examples 1-4 and Examples 7-8 still have relatively excellent fire extinguishing effects after repeated use, with a fast fire extinguishing speed. In particular, the repeated fire extinguishing effect of Example 8 is the most excellent. This may be because the cooling effect of aluminum hydroxide is conducive to the repair of the coating by the epoxy resin microcapsules and the encapsulation of the fire extinguishing agent by poly(N-isopropylacrylamide). The composite material of Comparative Example 1 relies on the release of perfluorocyclohexanone for fire extinguishing during the first fire extinguishing process, so the repeated fire extinguishing effect is not good. The composite material of Comparative Example 2 lacks N-isopropylacrylamide and is difficult to effectively prevent the release of perfluorocyclohexanone, so the second fire extinguishing effect is not good. Even during the third fire extinguishing, the fire extinguishing function has been lost. The composite material of Comparative Example 3 has lost its fire extinguishing function during the second fire extinguishing. This may be because sodium bicarbonate generates carbon dioxide gas with a certain pressure, which greatly damages the sodium alginate coating layer and has a large release amount, and is almost consumed after the first fire extinguishing, so it does not have the secondary fire extinguishing effect. In addition, we found that with the extension of the storage time of the carpets made of different composite materials, the content of perfluorocyclohexanone has changed to varying degrees. We respectively tested the retention rates of the perfluorocyclohexanone content stored in the dark for 6 months and 12 months. The retention rate (%) = the content of perfluorocyclohexanone at the time of testing / the initial content of perfluorocyclohexanone * 100%. The results are shown in Table 3.

[0140] Table 3

[0141] Retention rate after 6 months (%) Retention rate after 12 months (%) Example 1 97.5 87.7 Example 2 96.2 88.1 Example 3 96.6 88.2 Example 4 97.2 87.5 Example 7 97..3 88.4 Example 8 97..6 88.9 Comparative Example 1 94.7 72.4 Comparative Example 2 97.1 89.1

[0142] As can be seen from Table 3, the perfluorocyclohexanone of the composite materials in Examples 1-4 and Examples 7-8 all have good retention rates, but the retention rate of Comparative Example 1 is relatively low. This may be because of the lack of protection of the sodium bicarbonate layer.

[0143] It should be noted that the fire extinguishing effect and the retention effect of perfluorocyclohexanone in Examples 5-6 are equivalent to those in Example 4.

[0144] The specific implementation manners of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A composite material for a fire-fighting blanket, characterized in that, The raw materials are calculated by weight and include: 40 - 50 parts of phenolic resin, 20 - 30 parts of acrylic resin, 4 - 8 parts of hexamethylenetetramine, 1 - 3 parts of polyol glycidyl ether, 15 - 20 parts of ammonium polyphosphate, 4 - 10 parts of pentaerythritol, 1 - 2 parts of dispersant, 10 - 15 parts of fire extinguishing agent microcapsules, 5 - 10 parts of poly(N - isopropylacrylamide), and 5 - 10 parts of solvent.

2. The composite material for a fire-fighting blanket according to claim 1, wherein It also includes 5 - 10 parts of epoxy resin microcapsules.

3. The composite material for a fire-fighting blanket according to claim 1 or 2, characterized in that, It also includes 5 - 10 parts of aluminum hydroxide.

4. The composite material for a fire-fighting blanket according to claim 1, wherein, The dispersant is a sodium polyacrylate salt; and / or, the solvent is one or two of isopropanol, ethanol, and acetone.

5. The composite material for a fire-fighting blanket according to claim 1, characterized in that, The fire extinguishing agent microcapsules sequentially include a first core, a first coating layer, a sodium bicarbonate layer, and a second coating layer from the inside out; the first core includes perfluorhexanone and montmorillonite; the sodium bicarbonate layer includes sodium bicarbonate and montmorillonite; in the first core, the mass ratio of perfluorhexanone to montmorillonite is (4 - 6):1; in the sodium bicarbonate layer, the mass ratio of sodium bicarbonate to montmorillonite is (1 - 2):

1.

6. The composite material for a fire-fighting fire blanket according to claim 5, wherein, The first coating layer is an epoxy resin coating layer, and the second coating layer is a sodium alginate coating layer.

7. The composite material for a fire-fighting blanket according to any one of claims 1-6, characterized in that The fire extinguishing agent microcapsules are prepared by the following steps: Mix perfluorhexanone and montmorillonite to form a core. Dissolve epoxy resin in an organic solvent, add an emulsifier to obtain a solution containing epoxy resin, add the core to the solution containing epoxy resin, and then add a curing agent to obtain a core coated with epoxy resin. Mix sodium bicarbonate, montmorillonite, and water to obtain a suspension. Add the core coated with epoxy resin to the suspension to obtain microcapsules coated with a sodium bicarbonate layer. Mix the microcapsules coated with a sodium bicarbonate layer with an aqueous solution of sodium alginate to obtain the fire extinguishing agent microcapsules.

8. The composite material for a fire-fighting blanket according to claim 2, wherein The epoxy resin microcapsules sequentially include a second core, a third coating layer, and a fourth coating layer from the inside out.

9. The composite material for a fire-fighting blanket according to claim 2 or 8, characterized in that, The epoxy resin microcapsules are prepared by the following steps: Mix epoxy resin, water, and an emulsifier to obtain an epoxy resin solution. Dropwise add a polyvinyl alcohol solution to the epoxy resin solution to obtain an emulsion of epoxy resin coated with polyvinyl alcohol. Continue to add a phenolic resin prepolymer to the emulsion of epoxy resin already coated with polyvinyl alcohol, add an initiator at the same time, and adjust the pH to 8 - 9 and stir to react to obtain the epoxy resin microcapsules.

10. A method for preparing the composite material for a fire-fighting blanket according to any one of claims 1-9, characterized in that, It includes the following steps: Mix phenolic resin and acrylic resin, then continue to add hexamethylenetetramine, polyol glycidyl ether, ammonium polyphosphate, and pentaerythritol and mix, then add a dispersant and N - isopropylacrylamide and mix, then add fire extinguishing agent microcapsules and mix, and then add a solvent and mix to obtain the composite material.

Images