Heat-insulating fire-extinguishing film as well as preparation method and application thereof

Abstract

The invention provides a heat-insulating fire-extinguishing film and a preparation method and application thereof, and relates to the technical field of heat-insulating fire-extinguishing material preparation. The preparation method of the heat-insulating fire-extinguishing film comprises the following steps: uniformly mixing 100 parts by weight of acrylic monomers and 50-300 parts by weight of urethane acrylate, adding a cross-linking agent and a functional additive, uniformly mixing, then adding a photoinitiator to obtain a mixed base material, adding 50-300 parts by weight of fire-extinguishing capsules and 50-300 parts by weight of heat-insulating filler into the mixed base material, uniformly mixing, and finally, carrying out heat-insulating fire-extinguishing treatment on the mixed base material to obtain the heat-insulating fire-extinguishing film. Uniformly stirring to obtain slurry; and calendering and curing the slurry to obtain the heat-insulating fire-extinguishing film. The prepared heat-insulating and fire-extinguishing film has good heat-insulating and fire-extinguishing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of heat-insulating fire-extinguishing materials, and particularly relates to a heat-insulating fire-extinguishing film, a preparation method thereof and an application thereof. Background Art

[0002] A storage battery is an electrochemical device that stores chemical energy and converts the chemical energy into electrical energy when necessary. After discharging, the internal active substances can be regenerated by charging, and the chemical energy can be converted into electrical energy again when discharging is required, also known as a secondary battery. When a thermal runaway occurs in a secondary battery cell, flames, gases, and internal chemical substances of the cell with a temperature above 700 °C can be ejected, causing unexpected losses. When a storage battery catches fire, usually a fire occurs in one of its internal energy storage units first, and the fire and heat spread to other nearby energy storage units, triggering a chain reaction to cause thermal runaway. If the fire and heat spread of the first ignited energy storage unit can be effectively blocked when a fire occurs, the thermal runaway can be effectively avoided. Therefore, developing a heat-insulating fire-extinguishing film that can both extinguish fires and block heat propagation, and timely blocking the fire and heat spread of the ignited energy storage unit to other nearby energy storage units has become a technical problem urgently to be solved in this field. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a heat-insulating fire-extinguishing film, a preparation method thereof and an application thereof, solves the technical problem that when a fire occurs in one energy storage unit in an energy storage device, the fire will spread to other nearby energy storage units, and realizes the effect of preventing thermal runaway of the energy storage device.

[0004] To achieve the above purposes, the present invention is realized through the following technical solutions:

[0005] In a first aspect, the present invention provides a preparation method of a heat-insulating fire-extinguishing film, comprising the following steps:

[0006] Providing 100 parts by weight of an acrylic monomer and 50 - 300 parts by weight of a polyurethane acrylate, mixing them evenly, adding a cross-linking agent and a functional additive, mixing them evenly, and then adding a photoinitiator to obtain a mixed substrate. Adding 50 - 300 parts by weight of fire-extinguishing capsules and 50 - 300 parts by weight of heat-insulating fillers to the mixed substrate, stirring evenly to obtain a slurry; the slurry is calendered and cured to obtain a heat-insulating fire-extinguishing film.

[0007] The preparation method of the heat-insulating fire-extinguishing film of the present application includes adding 50 - 300 parts by weight of fire-extinguishing capsules and 50 - 300 parts by weight of heat-insulating fillers to the mixed substrate. The fire-extinguishing capsules and heat-insulating fillers have a synergistic effect in reducing the thermal conductivity coefficient, thereby improving the heat-insulating performance of the heat-insulating fire-extinguishing film.

[0008] Preferably, the heat-insulating filler is selected from at least one of mica, glass fiber, silica aerogel, ceramic fiber, polyether ether ketone, polyimide, and calcium silicate.

[0009] Preferably, the heat-insulating filler includes polyether ether ketone, glass fiber, and polyimide. The weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, and the weight ratio of polyether ether ketone to polyimide is 1:1 - 1:5.

[0010] Controlling the weight ratio of polyether ether ketone, glass fiber, and polyimide within a suitable range enables the prepared heat-insulating fire-extinguishing film to have a relatively low thermal conductivity and good heat-insulating effect.

[0011] Preferably, the heat-insulating filler includes polyether ether ketone, glass fiber, and polyimide, and the weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:1.

[0012] Controlling the weight ratio of polyether ether ketone, glass fiber, and polyimide within a suitable range enables the prepared heat-insulating fire-extinguishing film to have a relatively low thermal conductivity and good heat-insulating effect.

[0013] Preferably, the addition amount of the cross-linking agent is 1 - 10 parts by weight, and the addition amount of the photoinitiator is 0.1 - 5 parts by weight.

[0014] Controlling the amount of the cross-linking agent within a suitable range can balance the processing performance and mechanical properties of the heat-insulating fire-extinguishing film. If the amount of the cross-linking agent used is less than 1 part by weight, it may have an adverse effect on the cohesion or weather resistance of the heat-insulating fire-extinguishing film, and the initial adhesion problem may occur. If it exceeds 10 parts by weight, the heat-insulating fire-extinguishing film may become brittle.

[0015] Preferably, the preparation method of the heat-insulating fire-extinguishing film satisfies at least one of the following conditions:

[0016] The acrylic monomer is selected from at least one of 2-ethylhexyl acrylate, butyl acrylate, butyl methacrylate, n-hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, 2-hydroxyethyl acrylate, and isobornyl acrylate;

[0017] The cross-linking agent is selected from at least one of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, difunctional acrylate-based cross-linking agent, triacrylate cross-linking agent, aziridine-based cross-linking agent, and epoxy-based cross-linking agent;

[0018] The functional additive includes at least one of a coupling agent, a dispersant, an antifoaming agent, a dye, a pigment, and an antioxidant;

[0019] Coupling agents promote the cross-linking of acrylic monomers to form a three-dimensional network, which resists the damage to the heat-insulating fire-extinguishing film caused by sunlight, rain, or temperature over time, and improves the durability of the heat-insulating fire-extinguishing film. The function of the dispersant can prevent the precipitation of fire-extinguishing capsules and heat-insulating fillers and reduce the surface tension, and the defoamer can inhibit the formation of bubbles. Dyes, pigments, ultraviolet light absorbers, antioxidants, etc. can be added within the range of maintaining their properties, and the addition amount can vary according to the characteristics of the final product to be targeted.

[0020] The photoinitiator is selected from at least one of benzoin ester ethyl ether, benzoin isosafrole ether, anisidine ethyl ether, benzoin, and benzyl ketal.

[0021] A photoinitiator is selected to cure and prepare the heat-insulating fire-extinguishing film under light conditions, avoiding the heating curing step, preventing the triggering of fire-extinguishing capsules due to poor control of the heating temperature during the heating process, and improving the yield of the heat-insulating fire-extinguishing film.

[0022] In a second aspect, the present invention provides a heat-insulating fire-extinguishing film, which is prepared by the preparation method described in the first aspect. The heat-insulating fire-extinguishing film includes 100 parts by weight of acrylic monomers, 50 - 300 parts by weight of polyurethane acrylate, 50 - 300 parts by weight of fire-extinguishing capsules, and 50 - 300 parts by weight of heat-insulating fillers. The heat-insulating fillers include polyether ether ketone, glass fiber, and polyimide, and the weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:1;

[0023] Controlling the weight parts of fire-extinguishing capsules and heat-insulating fillers in the heat-insulating fire-extinguishing film within a suitable range can exert the synergistic effect of the two in reducing the thermal conductivity of the heat-insulating fire-extinguishing film and improve the heat-insulating performance of the heat-insulating fire-extinguishing film. Controlling the weight ratio of polyether ether ketone, glass fiber, and polyimide enables the prepared heat-insulating fire-extinguishing film to have a lower thermal conductivity and improve its heat-insulating effect.

[0024] In a third aspect, the present invention provides an application of the heat-insulating fire-extinguishing film prepared by the preparation method described in the first aspect or the heat-insulating fire-extinguishing film described in the second aspect in preventing the energy storage device from catching fire, and the heat-insulating fire-extinguishing film is covered on the outer peripheral surface of the energy storage device.

[0025] Covering the heat-insulating fire-extinguishing film on the outer peripheral surface of the energy storage device can prevent the fire of the energy storage unit from spreading to other nearby energy storage units, and the construction operation is convenient.

[0026] Beneficial Effects

[0027] The present invention provides a heat-insulating fire-extinguishing film, its preparation method, and application. Compared with the prior art, the following beneficial effects are achieved:

[0028] 1. The preparation method of the heat-insulating fire-extinguishing film of the present application includes fire-extinguishing capsules and heat-insulating fillers. The heat-insulating performance of the heat-insulating fire-extinguishing film is improved by the synergistic effect of the fire-extinguishing capsules and the heat-insulating fillers.

[0029] 2. The heat-insulating filler includes at least one of polyether ether ketone, glass fiber, and polyimide. Among them, the weight ratio of polyether ether ketone to glass fiber affects the heat insulation of the heat-insulating fire-extinguishing film. When the weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, the thermal conductivity is smaller. The weight ratio of polyether ether ketone to polyimide also affects its heat insulation. When the weight ratio of polyether ether ketone to polyimide is 1:1 - 1:5, the thermal conductivity is smaller.

[0030] 3. The addition amount of the heat-insulating filler is 50 - 300 parts by weight, which can balance the heat-insulating effect of the heat-insulating fire-extinguishing film and the mechanical properties of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic diagram of the curing process of the heat-insulating fire-extinguishing film in Embodiment 1;

[0033] Figure 2 It is a physical photo of the heat-insulating fire-extinguishing film in Embodiment 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0035] The embodiments of the present application provide a heat-insulating fire-extinguishing film, its preparation method and application, solving the technical problem that when a fire occurs in one energy storage unit in an energy storage device, the fire will spread to other nearby energy storage units, and achieving the effect of preventing the energy storage device from experiencing thermal runaway.

[0036] The technical solutions in the embodiments of the present application for solving the above technical problems are generally as follows:

[0037] With the development of new energy vehicles, the safety requirements for the power source of new energy vehicles, namely the storage battery, are getting higher and higher. When the battery cell undergoes thermal runaway, flames, gases, and internal chemical substances of the battery cell with a temperature above 700 °C can be ejected. Moreover, when a fire occurs in the energy storage unit within the energy storage device, when a fire occurs in one energy storage unit, the fire will spread to other nearby energy storage units. Therefore, developing a heat-insulating fire extinguishing film to prevent the fire of the burning energy storage unit from spreading to other nearby energy storage units has become a technical problem that urgently needs to be solved in this field.

[0038]

Preparation Method of Heat-Insulating Fire Extinguishing Film

[0039] In summary, the present invention provides a preparation method of a heat-insulating fire extinguishing film, which includes the following steps:

[0040] Provide 100 parts by weight of acrylic monomers and 50 - 300 parts by weight of polyurethane acrylate, mix them evenly, add a cross-linking agent and a functional additive, mix them evenly, and then add a photoinitiator to obtain a mixed substrate. Add 50 - 300 parts by weight of fire extinguishing capsules and 50 - 300 parts by weight of heat-insulating fillers to the mixed substrate, stir evenly to obtain a slurry; the slurry is calendered and cured to obtain a heat-insulating fire extinguishing film.

[0041] The preparation method of the heat-insulating fire extinguishing film in this application includes adding 50 - 300 parts by weight of fire extinguishing capsules and 50 - 300 parts by weight of heat-insulating fillers to the mixed substrate. The fire extinguishing capsules and heat-insulating fillers have a synergistic effect in reducing the thermal conductivity coefficient, thereby improving the heat-insulating performance of the heat-insulating fire extinguishing film.

[0042] In this article, the term "acrylic monomer" refers to unsaturated carboxylic acids, including but not limited to 2-ethylhexyl acrylate, butyl acrylate, butyl methacrylate, n-hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, 2-hydroxyethyl acrylate, and isobornyl acrylate.

[0043] In this article, the term "polyurethane acrylate" refers to a substance containing an acrylic functional group and a urethane bond in its molecule. Exemplarily, the functionality is 1 - 4, and the viscosity is 5000 CPS polyurethane acrylate system at 60 °C. The dosage of polyurethane acrylate can be 50, 100, 150, 200, 250, 300, or any part by weight in between.

[0044] In this text, the term "fire extinguishing capsule" refers to a fire extinguishing material formed by encapsulating a fire extinguishing agent in a polymer shell. The fire extinguishing capsule includes a shell and fire extinguishing contents inside the shell, and the fire extinguishing contents are selected from NOVEC1230, heptafluorobutyric anhydride, ethyl heptafluorobutyrate, tetradecafluorohexane, and tetrachloro-perfluoro-6-methyl-3,5-dioxoheptane. The evaporation temperature of heptafluorobutyric anhydride, ethyl heptafluorobutyrate, tetradecafluorohexane, and tetrachloro-perfluoro-6-methyl-3,5-dioxoheptane is above 45 °C.

[0045] The evaporation temperature of heptafluorobutyric anhydride, ethyl heptafluorobutyrate, tetradecafluorohexane, and tetrachloro-perfluoro-6-methyl-3,5-dioxoheptane is above 45 °C, which improves the yield of the heat-insulating fire extinguishing film.

[0046] The dosage of the fire extinguishing capsule can be 50, 100, 150, 200, 250, 300 or any weight part in between.

[0047] The diameter of the fire extinguishing capsule can be 30μm, 35μm, 40μm, 45μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm or any value in between. Controlling the diameter of the fire extinguishing capsule within a suitable range, after the fire extinguishing gas is released, micropores are formed, which play a synergistic role with the heat-insulating filler to improve the heat insulation of the heat-insulating fire extinguishing film.

[0048] Preferably, the heat-insulating filler is selected from at least one of mica, glass fiber, silica aerogel, ceramic fiber, polyether ether ketone, polyimide, and calcium silicate. The dosage of the heat-insulating filler can be 50, 100, 150, 200, 250, 300 or any weight part in between.

[0049] Preferably, the heat-insulating filler includes polyether ether ketone, glass fiber, and polyimide. The weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, for example, 1:2, 1:3, 1:4 or any value in between. The weight ratio of polyether ether ketone to polyimide is 1:1 - 1:5, for example, 1:1, 1:2, 1:3, 1:4, 1:5 or any value in between.

[0050] Controlling the weight ratio of polyether ether ketone, glass fiber, and polyimide within a suitable range makes the prepared heat-insulating fire extinguishing film have a smaller thermal conductivity and better heat insulation effect.

[0051] Preferably, the heat-insulating filler includes polyether ether ketone, glass fiber, and polyimide, and the weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:1.

[0052] Control the weight ratios of polyether ether ketone, glass fiber, and polyimide within a suitable range so that the prepared heat-insulating and fire-extinguishing film has a relatively low thermal conductivity and good heat-insulating effect.

[0053] Preferably, the addition amount of the crosslinking agent can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or any weight part therebetween, and the addition amount of the photoinitiator can be 0.1, 0.5, 1, 2, 3, 4, 5 or any weight part therebetween.

[0054] Control the amount of the crosslinking agent within a suitable range to balance the processing performance and mechanical properties of the heat-insulating and fire-extinguishing film. If the amount of the crosslinking agent used is less than 1 weight part, it may have an adverse effect on the cohesion or weather resistance of the heat-insulating and fire-extinguishing film, and the initial adhesion problem may occur. If more than 10 weight parts are used, the heat-insulating and fire-extinguishing film may become brittle.

[0055] Preferably, the method for preparing the heat-insulating and fire-extinguishing film satisfies at least one of the following conditions:

[0056] The crosslinking agent is selected from at least one of ethylene glycol diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, difunctional acrylate-based crosslinking agent, triacrylate crosslinking agent, aziridine-based crosslinking agent, and epoxy-based crosslinking agent;

[0057] The functional additive includes at least one of a coupling agent, a dispersant, an antifoaming agent, a dye, a pigment, and an antioxidant;

[0058] The coupling agent promotes the crosslinking of acrylic monomers to form a three-dimensional network, resists the damage to the heat-insulating and fire-extinguishing film caused by sunlight, rain, or temperature over time, and improves the durability of the heat-insulating and fire-extinguishing film. The function of the dispersant can prevent the precipitation of fire-extinguishing capsules and heat-insulating fillers and reduce the surface tension. The antifoaming agent can inhibit the formation of bubbles. Dyes, pigments, ultraviolet light inhibitors, antioxidants, etc. can be added within the range of maintaining their performance, and the addition amount can vary according to the characteristics of the final product to be targeted.

[0059] The photoinitiator is selected from at least one of benzoin ether, isoeugenol benzoin ether, anisidine ether, benzoin, and benzyl ketal.

[0060] Select a photoinitiator to cure the heat-insulating and fire-extinguishing film under light conditions, avoid the heating and curing step, prevent the triggering of the fire-extinguishing capsule due to poor control of the heating temperature during the heating process, and improve the yield of the heat-insulating and fire-extinguishing film.

[0061] In some embodiments, during the curing and film-forming stage, the slurry is conveyed onto a carrier film, which includes a lower carrier film for carrying the slurry and an upper carrier film covering the upper surface of the slurry, and at least one of the lower carrier film and the upper carrier film is a PET film.

[0062]

Heat-insulating fire-extinguishing film

[0063] The present invention provides a heat-insulating fire-extinguishing film, which includes 100 parts by weight of an acrylic monomer, 50 - 300 parts by weight of a polyurethane acrylate, 50 - 300 parts by weight of fire-extinguishing capsules, and 50 - 300 parts by weight of heat-insulating fillers. The heat-insulating fillers include polyether ether ketone, glass fiber, and polyimide, and the weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:1.

[0064] By controlling the weight parts of the fire-extinguishing capsules and the heat-insulating fillers in the heat-insulating fire-extinguishing film within a suitable range, the synergistic effect of the two in reducing the thermal conductivity coefficient of the heat-insulating fire-extinguishing film is exerted, and the heat-insulating performance of the heat-insulating fire-extinguishing film is improved. By controlling the weight ratio of polyether ether ketone, glass fiber, and polyimide, the prepared heat-insulating fire-extinguishing film has a lower thermal conductivity coefficient, improving its heat-insulating effect.

[0065] The preparation method of the heat-insulating fire-extinguishing film includes the following steps:

[0066] Provide 100 parts by weight of an acrylic monomer and 50 - 300 parts by weight of a polyurethane acrylate, mix them evenly, add a cross-linking agent and a functional additive, mix them evenly, and then add a photoinitiator to obtain a mixed substrate. Add 50 - 300 parts by weight of fire-extinguishing capsules and 50 - 300 parts by weight of heat-insulating fillers to the mixed substrate, stir evenly to obtain a slurry; the slurry is calendered and cured to obtain a heat-insulating fire-extinguishing film.

[0067] In some embodiments, the photoinitiator can be a substance that absorbs energy at a certain wavelength in the ultraviolet region (250 - 420 nm) to generate free radicals, cations, etc. For example, it is ethyl benzoate ether, isoeugenol benzoate, anisidine ether, benzoin, benzyl ketal, etc.

[0068] In some embodiments, an ultraviolet lamp is used for the curing operation, and the power of the ultraviolet lamp is 30 W to 150 W. For example, 30 W, 50 W, 80 W, 90 W, 110 W, 130 W, 150 W, or any value therebetween.

[0069] In some embodiments, the thickness of the heat-insulating fire-extinguishing film can be 0.25 mm, 0.5 mm, 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, or any value therebetween.

[0070] In some embodiments, the fireproof rating of the heat-insulating fire-extinguishing film can be tested using methods and equipment known in the art. As an example: The fire resistance rating is tested in accordance with GB / T 15903-1995, and the instrument model is the touch screen controlled textile vertical burning tester of Dongguan Tuojin Instruments Co., Ltd.

[0071] In some embodiments, the breaking strength of the heat-insulating fire-extinguishing film can be tested using methods and equipment known in the art. As an example: The determination of the tensile properties of plastics is carried out in accordance with GB / T 1040.1-2018. Exemplarily, a universal testing machine, SHIMADZU, model AGS-X, Japan, is used. The unit is MPa.

[0072] In some embodiments, the thermal conductivity of the heat-insulating fire-extinguishing film can be tested using methods and equipment known in the art. As an example: It is tested in accordance with GB / T 20671.10-2006 Classification system and test methods for non-metallic gasket materials - Part 10: Test method for thermal conductivity of gasket materials. Exemplarily, it is tested with the YBF-3 thermal conductivity tester of Xi'an Jingda Testing Equipment Co., Ltd.

[0073] In this article, "thermal conductivity" refers to the amount of heat transferred through an area of 1 square meter in 1 second under steady heat transfer conditions, for a material that is 1 meter thick and has a temperature difference of 1 degree (K) between the two surface sides. It is represented by λ, and the unit is w / (m·k).

[0074] In some embodiments, the preparation method of the heat-insulating fire-extinguishing film may further include: The slurry is coated on at least one side of a PET film, and after curing to form a film, a commercially available heat-insulating film is adhered with double-sided tape to form the heat-insulating fire-extinguishing film.

[0075] In some embodiments, the preparation method of the heat-insulating fire-extinguishing film may further include: The slurry is coated on at least one side of a commercially available heat-insulating film, and after curing to form a film, a commercially available heat-insulating film is adhered with double-sided tape to prepare the heat-insulating fire-extinguishing film.

[0076]

Application of the heat-insulating fire-extinguishing film

[0077] The present invention provides an application of the heat-insulating fire-extinguishing film prepared by the preparation method described in the first aspect or the heat-insulating fire-extinguishing film described in the second aspect in preventing the energy storage device from catching fire, and the heat-insulating fire-extinguishing film is covered on the outer peripheral surface of the energy storage device.

[0078] Covering the heat-insulating fire-extinguishing film on the outer peripheral surface of the energy storage device can prevent the fire of the energy storage unit from spreading to other nearby energy storage units, and the construction operation is convenient.

[0079] In this text, the term "energy storage device" refers to a device or system capable of storing energy and releasing it when needed, including but not limited to mechanical energy storage devices, chemical energy storage devices, electromagnetic energy storage devices, or thermal energy storage devices. Among them, mechanical energy storage devices include pumped-storage devices and compressed-air energy storage devices, which store energy by using gravity or gas compression; chemical energy storage devices exist in the form of batteries, such as lithium-ion batteries, lead-acid batteries, and fuel cells, which store and release electrical energy through chemical reactions; electromagnetic energy storage devices are represented by supercapacitors, which can charge and discharge quickly and are suitable for occasions with instantaneous energy requirements; thermal energy storage devices refer to storing energy by using the temperature change of substances, such as salt-melting energy storage devices, etc.

[0080] In this text, the term "coating" means that the heat-insulating and fire-extinguishing film wraps and covers the outer peripheral surface of the energy storage device. The heat-insulating and fire-extinguishing film can be fixedly connected to the outer peripheral surface of the energy storage device or merely cover its outer peripheral surface. The fixed connection can adopt methods known in the art, including but not limited to gluing, welding, mechanical fixing, etc.

[0081] The heat-insulating and fire-extinguishing film wraps and covers the outer peripheral surface of the energy storage device. When a fire occurs in an energy storage unit, the heat-insulating and fire-extinguishing film promptly extinguishes the flame and at the same time confines the heat within the energy storage unit, preventing the fire and heat from spreading to other nearby energy storage units and preventing thermal runaway of the energy storage device.

[0082] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0083] I. Preparation method

[0084] Example 1

[0085] This example provides a preparation method of a heat-insulating and fire-extinguishing film, including the following steps:

[0086] S1. Prepare the slurry

[0087] Weigh 100 parts by weight of 2-ethylhexyl acrylate and 175 parts by weight of polyurethane acrylate and mix them evenly. Then add 5 parts by weight of crosslinking agent propylene glycol diacrylate, 1.5 parts by weight of coupling agent methacryloxypropyltrimethoxysilane, 1.5 parts by weight of dispersant polyvinylpyrrolidone, and 2 parts by weight of pigment yellow 191, and mix them evenly. Then add 2.5 parts by weight of photoinitiator benzoin isoeugenyl ether to obtain a mixed substrate. Then add 100 parts by weight of fire extinguishing capsules of tetrachloro-perfluoro-6-methyl-3,5-dioxoheptane with a diameter of 30 μm to the mixed substrate, stir to make the fire extinguishing capsules evenly dispersed in the mixed substrate, and then add 150 parts by weight of heat insulation filler, stir evenly to prepare a slurry. Among them, the heat insulation filler includes polyether ether ketone, glass fiber, and polyimide, and the weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:1.

[0088] S2. Prepare a heat insulation fire extinguishing film

[0089] As Figure 1 shown, pour the prepared slurry into a glue tank, and install the first PET carrier film 4 and the second PET carrier film 6 on the first transfer roller 3 and the second transfer roller 5 of the calender respectively. Transport the slurry in the glue tank to the second PET carrier film 6 through the coating head 1 and the glue baffle 2. At the same time, start the first transfer roller 3 and the second transfer roller 5 of the calender, so that the first PET carrier film 4, the second PET carrier film 6, and the slurry on the second PET carrier film 6 pass through the first transfer roller 3 and the second transfer roller 5 of the calender together. Under the cooperation of the first transfer roller 3 and the second transfer roller 5, roll the first PET carrier film 4, the second PET carrier film 6, and the slurry therebetween to control the thickness of the slurry; the first PET carrier film 4, the second PET carrier film 6, and the slurry therebetween after the rolling process enter the ultraviolet lamp box 7 together. The power of the ultraviolet lamp is 80W. Under the action of ultraviolet light, the slurry cures to form a heat insulation fire extinguishing film 8, and it is wound up by the winding roller 9. The photo of the heat insulation fire extinguishing film is as Figure 2 shown.

[0090] Examples 2-5

[0091] In Examples 2-5, the heat insulation filler includes polyether ether ketone, glass fiber, and polyimide. Among them, the total weight of polyether ether ketone and glass fiber is 120, and polyimide is 30 parts by weight. The difference from Example 1 is that the weight ratio of polyether ether ketone and glass fiber in the heat insulation filler component is different. The specific ratio is shown in Table 1, and the others are the same as Example 1.

[0092] Table 1 Example 1 Example 2 Example 3 Example 4 Example 5 Weight ratio of polyetheretherketone and glass fiber 1:3 1:2 1:4 1:1.5 1:5

[0093] Examples 6-9

[0094] In Examples 6-9, the heat-insulating filler includes polyetheretherketone, glass fiber, and polyimide. The total weight parts of polyetheretherketone and polyimide are 60 parts, and the glass fiber is 90 parts. The difference from Example 1 is that the weight part ratio of polyetheretherketone and polyimide is different. The specific ratio is shown in Table 2, and the others are the same as in Example 1.

[0095] Table 2 Example 6 Example 7 Example 8 Example 9 Weight ratio of polyetheretherketone and polyimide 1:3 1:5 1:0.3 1:7

[0096] Examples 10-17

[0097] In Examples 10-17, the heat-insulating filler includes polyetheretherketone, glass fiber, and polyimide. The weight part ratio of polyetheretherketone, glass fiber, and polyimide is 1:3:1. The difference from Example 1 is the amount of the heat-insulating filler used. The specific amount is shown in Table 3, and the others are the same as in Example 1.

[0098] Table 3 Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Weight parts of heat insulation filler 50 100 200 300 30 40 320 330

[0099] Comparative Example 1

[0100] The difference between this comparative example and Example 1 is that the raw materials for preparing the slurry do not include the fire-extinguishing capsules, and the weight part of the heat-insulating filler is 250 parts, and the others are the same as in Example 1.

[0101] Comparative Example 2

[0102] The difference between this comparative example and Example 1 is that the raw materials for preparing the slurry do not include the heat-insulating filler, and the weight part of the fire-extinguishing capsules is 250 parts, and the others are the same as in Example 1.

[0103] II. Test Methods

[0104] 1. Thermal Conductivity of the Heat-Insulating Fire-Fighting Film

[0105] The test is carried out in accordance with GB / T 20671.10-2006 Non-metallic Gasket Material Classification System and Test Methods - Part 10: Test Method for Thermal Conductivity of Gasket Materials. Specifically, the size of the cut specimen is a diameter of 50.8 mm ± 0.25 mm and a thickness of 5.0 mm - 6.0 mm. The test temperature is controlled at 10°C. Open the pressurizing device, take out the specimen tray, place the specimen on the tray, and ensure that there are no any foreign impurities in the tray. Put the tray into the test chamber and fix it in the corresponding position with a spherical plug. Close the test chamber door, set the air control switch to the "rise gear", and let the specimen unit rise automatically until the specimen is clamped between the upper and lower heating plates. Control the pressure applied to the specimen to be 0.345 MPa by adjusting the pressure regulator at the rear of the unit. After 1 h from the start of the test, the readings of each instrument tend to be stable. Directly read the thermal conductivity value of the specimen from the instrument on the console and record it.

[0106] 2. Tensile Strength of the Heat-Insulating Fire-Fighting Film

[0107] Cut the heat-insulating fire-resistant film into dumbbell-shaped specimens with a width of 4 mm and a thickness of 0.03 mm using a cutting knife. Conduct a tensile test on the film using a universal testing machine with a maximum load of 100 N at a room temperature tensile rate of 100 mm / min.

[0108] 3. Flame Resistance of the Heat-Insulating Fire-Fighting Film

[0109] Test according to the hanging method in the test method for flame resistance of pressure-sensitive adhesive tapes (GB / T 15903-1995). Before sampling, remove the outermost 5 turns of the roll-shaped fire-fighting film in advance, then unwind it evenly and cut 6 specimens with a length of 300 mm and a width of 25 mm. Make marking lines at 50 mm and 150 mm from the top end on the back of each specimen. The prepared specimens have no defects such as irreversible deformation and surface contamination. Clamp one end of the prepared specimen with a fixture and freely hang it inside the test protective cover; overlap and bond about 2 mm of the bottom edge of the ignition material with the lower end of the specimen closest to the 50 mm marking; immediately remove the ignition source after igniting the apex of the triangle of the ignition material with a flame of about 20 mm in length, and close the protective cover door. For specimens that self-extinguish after combustion, measure the distance from the marking line to the nearest point on the charred edge of the specimen with a steel straight ruler. Calculate the average burning length (AEB) according to formula (1), and then determine the flame resistance grade according to Table 4.

[0110] (1),

[0111] Where: L—the distance from the marking line at 150 mm to the nearest point on the charred edge of the specimen, unit: mm;

[0112] N—the number of specimens tested.

[0113] Table 4 Flame resistance grade Average burning length (AEB) Description Grade 0 AEB = 0 Non-combustible (the specimen does not burn after the ignition material burns out) Grade 1 0 < AEB ≤ 50 Self-extinguishing, good flame resistance Grade 2 50 < AEB < 150 Combustible, poor flame resistance Grade 3 AEB ≥ 150 Combustible

[0114] III. Test Results

[0115] The performance test results of the heat-insulating fire-fighting films prepared in the above examples and comparative examples are shown in Table 5.

[0116] Table 5 Thermal conductivity / w / (m·k) Breaking strength / MPa Flame resistance grade Example 1 0.018 9.5 0 Example 2 0.023 9.2 0 Example 3 0.020 9.7 0 Example 4 0.412 9.6 0 Example 5 0.356 9.4 0 Example 6 0.025 9.1 0 Example 7 0.029 9.4 0 Example 8 0.719 9.6 0 Example 9 0.698 9.7 0 Example 10 0.042 15.4 0 Example 11 0.022 12.3 0 Example 12 0.015 6.5 0 Example 13 0.012 3.7 0 Example 14 0.088 18.5 0 Example 15 0.069 16.5 0 Example 16 0.010 2.3 0 Example 17 0.010 1.5 0 Comparative Example 1 1.208 6.2 3 Comparative Example 2 1.547 9.9 0

[0117] As can be seen from Table 5, comparing Examples 1-3 with Examples 4 and 5, the weight ratio of polyether ether ketone and glass fiber has an impact on the heat insulation performance of the heat insulation and fire extinguishing film. When the total weight parts of polyether ether ketone and glass fiber are 120 and the weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, the heat conduction coefficient of the heat insulation and fire extinguishing film is smaller and the heat insulation effect is better. In particular, when the weight ratio of polyether ether ketone to glass fiber is 1:3, the heat conduction coefficient of the heat insulation and fire extinguishing film is the smallest and the heat insulation effect is the best. Comparing Examples 1, 6 - 7 with Examples 8 - 9, it can be seen that the weight ratio of polyether ether ketone and polyimide has an impact on the heat insulation performance of the heat insulation and fire extinguishing film. When the total weight parts of polyether ether ketone and polyimide are 60 and the weight ratio of polyether ether ketone to polyimide is 1:1 - 1:5, the heat conduction coefficient of the heat insulation and fire extinguishing film is smaller and the heat insulation effect is better. In particular, when the weight ratio of polyether ether ketone to polyimide is 1:1, the heat conduction coefficient of the heat insulation and fire extinguishing film is the smallest and the heat insulation effect is the best. From the comparison between Examples 1, 10 - 13 and Examples 14 - 17, it can be known that when the addition amount of the heat insulation filler composed of polyether ether ketone, glass fiber and polyimide with a weight ratio of 1:3:1 is 50 - 300 weight parts, the heat insulation and fire extinguishing film can take into account both the heat insulation effect and its mechanical properties. From the comparison between Example 1 and Comparative Examples 1 - 2, it can be known that the heat conduction coefficient of the heat insulation and fire extinguishing film in Example 1 is lower, while the heat conduction coefficients of the heat insulation and fire extinguishing films in Comparative Examples 1 and 2 are higher. Therefore, the heat insulation and fire extinguishing film prepared when the fire extinguishing capsule and the heat insulation filler exist simultaneously has excellent heat insulation effect. Without any one of the fire extinguishing capsule and the heat insulation filler, the excellent heat insulation effect of Example 1 cannot be achieved. Therefore, the fire extinguishing capsule and the heat insulation filler in the solution of the present application have a synergistic effect in improving the heat insulation of the heat insulation and fire extinguishing film.

[0118] In summary, compared with the prior art, the following beneficial effects are achieved:

[0119] 1. The preparation method of the heat insulation and fire extinguishing film of the present application includes a fire extinguishing capsule and a heat insulation filler, and the heat insulation performance of the heat insulation and fire extinguishing film is improved under the synergistic effect of the fire extinguishing capsule and the heat insulation filler.

[0120] 2. The heat insulation filler includes at least one of polyether ether ketone, glass fiber and polyimide. Among them, the weight ratio of polyether ether ketone and glass fiber has an impact on the heat insulation of the heat insulation and fire extinguishing film. When the weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, the heat conduction coefficient is smaller. The weight ratio of polyether ether ketone and polyimide has an impact on its heat insulation. When the weight ratio of polyether ether ketone to polyimide is 1:1 - 1:5, the heat conduction coefficient is smaller.

[0121] 3. The addition amount of the heat insulation filler is 50 - 300 weight parts, which can take into account both the heat insulation effect of the heat insulation and fire extinguishing film and the mechanical properties of the film.

[0122] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0124] The present invention illustrates the detailed process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A preparation method of a heat-insulating fire extinguishing film, characterized in that, It includes the following steps: Provide 100 parts by weight of acrylic monomers and 50 - 300 parts by weight of polyurethane acrylate, mix them evenly, add a crosslinking agent and functional additives, mix evenly, then add a photoinitiator to obtain a mixed substrate. Add 50 - 300 parts by weight of fire extinguishing capsules and 50 - 300 parts by weight of heat insulation fillers to the mixed substrate, stir evenly to obtain a slurry; after calendering and curing the slurry, a heat insulation and fire extinguishing film is obtained.

2. The preparation method of the heat-insulating fire-extinguishing film according to claim 1, characterized in that, The heat insulation filler is selected from at least one of mica, glass fiber, silica aerogel, ceramic fiber, polyether ether ketone, polyimide, and calcium silicate.

3. The preparation method of the heat-insulating fire-extinguishing film according to claim 1, characterized in that, The heat insulation filler includes polyether ether ketone, glass fiber, and polyimide. The weight ratio of polyether ether ketone to glass fiber is 1:2 - 1:4, and the weight ratio of polyether ether ketone to polyimide is 1:1 - 1:

5.

4. The preparation method of the heat-insulating fire-extinguishing film according to claim 1, characterized in that, The heat insulation filler includes polyether ether ketone, glass fiber, and polyimide. The weight ratio of polyether ether ketone, glass fiber, and polyimide is 1:3:

1.

5. The preparation method of the heat-insulating fire-extinguishing film according to claim 1, characterized in that The addition amount of the crosslinking agent is 1 - 10 parts by weight, and the addition amount of the photoinitiator is 0.1 - 5 parts by weight.

6. The preparation method of the heat-insulating fire-extinguishing film according to claim 1, characterized in that, Meet at least one of the following conditions: The acrylic monomer is selected from at least one of 2-ethylhexyl acrylate, butyl acrylate, butyl methacrylate, n-hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, 2-hydroxyethyl acrylate, and isobornyl acrylate; The crosslinking agent is selected from at least one of ethylene glycol diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, difunctional acrylate-based crosslinking agent, triacrylate crosslinking agent, aziridine-based crosslinking agent, and epoxy-based crosslinking agent; The functional additive includes at least one of a coupling agent, a dispersant, an antifoaming agent, a dye, a pigment, and an antioxidant; The photoinitiator is selected from at least one of benzoin ethyl ether, benzoin isosafrole ether, anisidine ethyl ether, benzoin, and benzyl ketal.

7. A heat-insulating fire-extinguishing film, characterized in that, The heat insulation and fire extinguishing film is prepared by the preparation method described in claim 1.

8. Use of the heat-insulating fire extinguishing film prepared by the preparation method according to any one of claims 1-6 or the heat-insulating fire extinguishing film according to claim 7 in preventing an energy storage device from catching fire, characterized in that The heat insulation and fire extinguishing film is covered on the outer peripheral surface of the energy storage device.

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