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CN-122011746-A - Aerogel heat-sealing film based on phase change material blending and thermal runaway inhibition method thereof

CN122011746ACN 122011746 ACN122011746 ACN 122011746ACN-122011746-A

Abstract

The invention belongs to the technical field of aerogel heat-sealing films, and in particular relates to an aerogel heat-sealing film based on phase change material blending and a thermal runaway inhibition method thereof, wherein the aerogel heat-sealing film is composed of a composite aerogel carrier, a main body aerogel and a hydrophobic modified aerogel 6-10 Parts of aerogel, 2-4 parts of reinforced aerogel, 2-4 parts of nitrogen doped graphene aerogel, a combination method of composite aerogel modification pretreatment, dual-phase change gradient composite coating and multifunctional auxiliary agent collaborative doping is adopted to construct a wide-temperature-range gradient heat storage system and a physical heat insulation and chemical combustion inhibition dual barrier, a dual-phase change material expands a heat storage area through gradient matching, a microcapsule coating and anti-migration system solves the problem of leakage, the composite aerogel realizes precise matching of heat conduction and heat insulation, and the synergistic flame retardant auxiliary agent is matched to effectively block heat conduction and flame propagation, so that the phase change enthalpy is improved by more than 40%, the combustion inhibition grade reaches V-0 level, and the pain points of single function and poor synergy of the traditional material are thoroughly solved.

Inventors

  • Cai Yuegang
  • ZHOU HAIXIA

Assignees

  • 深圳鑫富艺科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260129

Claims (8)

  1. 1. The aerogel heat-sealing film based on phase change material blending is characterized by being composed of the following materials: Composite aerogel carrier: main aerogel, hydrophobically modified 6-10 Parts of aerogel; 2-4 parts of reinforced aerogel, namely nitrogen-doped graphene aerogel; 0.3-0.8 part of modifier gamma-aminopropyl triethoxysilane; 15-25 parts of dispersion medium, namely absolute ethyl alcohol; Biphase transformation synergistic system: 30-45 parts of branched-chain behenate; 10-18 parts of modified calcium chloride hexahydrate; 8-12 parts of microcapsule coating agent, namely polyurea-melamine formaldehyde copolymer; Heat sealing film forming synergistic system: 25-35 parts of base film resin, namely aqueous polyurethane-acrylic ester copolymer; 1-3 parts of heat sealing promoter, namely polyethylene glycol diacrylate; 2-5 parts of an anti-migration agent, namely organic bentonite; 0.5-1.2 parts of cross-linking agent, namely aziridine derivative; 8-22 parts of water regulating components, namely deionized water; functional auxiliary agent: 3-6 parts of flame retardant, namely microencapsulated red phosphorus; 0.8-1.5 parts of antibacterial agent, namely nano zinc oxide; 0.3-0.6 part of antioxidant, namely hindered phenols 1010; the total weight of the materials is 100 parts.
  2. 2. The method for suppressing thermal runaway of an aerogel heat seal film based on phase change material blending according to claim 1, wherein the method is applied to the aerogel heat seal film of claim 1, comprising the steps of: s1, modifying and preprocessing a composite aerogel carrier: taking 6-10 parts by weight of hydrophobically modified starch Adding 15-25 parts of absolute ethyl alcohol dispersion medium into 2-4 parts of nitrogen-doped graphene aerogel and placing the aerogel and the nitrogen-doped graphene aerogel in an ultrasonic dispersing machine for dispersing for 30-45 minutes to ensure that aerogel particles are uniformly dispersed without agglomeration, and then dropwise adding 0.3-0.8 part of gamma-aminopropyl triethoxysilane modifier for reacting for 2-3 hours; S2, gradient compounding and microcapsule coating of a biphase variant system: According to parts by weight, firstly placing 30-45 parts of branched-chain docosane into a constant-temperature kettle with the temperature of 70-80 ℃ for melting, adding 10-18 parts of calcium chloride hexahydrate modified by montmorillonite intercalation, stirring for 30-40 minutes to form a homogeneous mixed phase-change system, then adding 8-12 parts of polyurea-melamine formaldehyde copolymer coating agent, and stirring for 1000-1200 ℃ at the temperature of 40-50 DEG C Stirring at a rotating speed for 60-90 minutes; s3, constructing a double dispersion medium premixing and anti-migration system: Cooling the S1 modified composite aerogel dispersion liquid to room temperature, slowly adding 8-22 parts of deionized water according to parts by weight, and keeping the rotating speed at 600-800 Stirring for 15-20 minutes to form an absolute ethyl alcohol-deionized water double-dispersion medium, then adding 2-5 parts of quaternary ammonium salt modified organic bentonite, continuously stirring for 30-40 minutes, forming a physical barrier network by using a layered structure of the organic bentonite, and slowly injecting the double-phase change microcapsule system prepared in the step S2 into a dispersion liquid; s4, accurately regulating and controlling a crosslinking film forming system: Adding 25-35 parts of aqueous polyurethane-acrylic ester copolymer into the S3 pre-dispersion system according to parts by weight, stirring for 20-30 minutes, slowly dripping 0.5-1.2 parts of aziridine derivative cross-linking agent, controlling the dripping speed to be 1-2 drops/second, reacting for 60-90 minutes at 30-40 ℃, then adding 1-3 parts of polyethylene glycol diacrylate heat-sealing accelerator, continuously stirring for 30 minutes, and optimizing the heat-sealing performance of the film material by using the flexible chain segment of PEGDA, wherein the viscosity of the system is controlled to be 500-800 mPa S in the reaction process, so that the subsequent film-forming continuity is ensured; s5, the multifunctional auxiliary agent is doped cooperatively and dispersed uniformly: according to the weight portion, firstly adding 3-6 portions of microencapsulated red phosphorus into the fourth-step crosslinking system to obtain 800-1000 portions Stirring at a rotating speed for 40-50 minutes to ensure uniform distribution of the microcapsules, adding 0.8-1.5 parts of nano zinc oxide, promoting nano particle dispersion through ultrasonic dispersion to avoid agglomeration, adding 0.3-0.6 part of hindered phenol 1010 antioxidant, and stirring for 20-30 minutes to complete system compounding; S6, gradient curing film forming and hydrophobic post-treatment: Injecting the fifth-step composite system into a casting machine trough, and controlling the casting speed to be 0.5-1 The casting thickness is 0.1-0.3 mm, the casting is carried out in a gradient curing oven for sectional treatment, the first stage is carried out at 60 ℃ for 30-40 minutes, most of water in the system is removed, the second stage is carried out at 90 ℃ for 60-90 minutes, the crosslinking reaction is promoted to be complete, the three-dimensional network structure is strengthened, the third stage is carried out at 120 ℃ for 20-30 minutes, the microcapsule flame retardant and the functional activity of the phase change material are activated, after the curing is completed, the film is cooled to room temperature, and 0.1-0.3 part of perfluorooctyl triethoxysilane hydrophobic modifier is applied in a spraying mode, and is baked for 15-20 minutes at 80 ℃ to form a hydrophobic surface layer.
  3. 3. The method for inhibiting thermal runaway of the aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptation algorithm of the composite aerogel carrier modification pretreatment in S1 is composed of the following formula: Compatibility improvement rate [ ] ) The formula: ; Wherein, the Single unit Interfacial tension of aerogel and phase change material; The interfacial tension of the composite aerogel before modification; the interfacial tension of the modified composite aerogel; dispersion uniformity [ (] ) The formula: ; Wherein, the Ultrasonic power; Ultrasonic time; aerogel solid-to-liquid ratio; viscosity of the dispersion medium; Thermal conductivity matching coefficient [ ] ) The formula: ; Wherein, the Hydrophobic Aerogel in parts by weight; nitrogen-doped graphene aerogel in parts by weight; aerogel thermal conductivity; nitrogen doped graphene aerogel thermal conductivity.
  4. 4. The method for inhibiting thermal runaway of aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptation algorithm of the two-phase variant system gradient composition and microcapsule coating in S2 is composed of the following formula: phase transition enthalpy improvement rate ) The formula: ; Wherein, the Branched behene in parts by weight; modified calcium chloride hexahydrate in parts by weight; enthalpy of organic phase change; An inorganic phase transition enthalpy; Enthalpy of a single organic phase change system; Leakage inhibition rate ) The formula: ; Wherein, the Leakage amount of uncoated inorganic phase change material; Leakage after coating; ×(1-0.12 -0.08 ); microcapsule coating rate; montmorillonite addition amount; temperature gradient coverage degree ) The formula: ; Wherein, the An organic phase transition temperature; an inorganic phase transition temperature; Highest temperature of the single phase-change system; the lowest temperature of the single phase change system.
  5. 5. The method for inhibiting thermal runaway of the aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptation algorithm for constructing the double dispersion medium premixing and migration resisting system in the step S3 is composed of the following formula: Dispersion uniformity coefficient [ ] ) The formula: ; Wherein, the Ultrasonic power; Ultrasonic time; Stirring rotation speed; Total solid-to-liquid ratio; viscosity of the double dispersion medium; Migration inhibition ratio [ ] ) The formula: Wherein, the The migration amount of the phase change material without an anti-migration system; There is a migration amount of the anti-migration system, , Organic bentonite in parts by weight; system stability [ (] ) The formula: Wherein, the Initial system viscosity; viscosity change after standing for 24 hours, , The volume ratio of the alcohol to the water is 1-1.5.
  6. 6. The method for inhibiting thermal runaway of the aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptive algorithm for accurately regulating and controlling the crosslinking film forming system in S4 is composed of the following formula: Degree of crosslinking [ (] ) The formula: ; Wherein, the Aziridine crosslinking agent in parts by weight; A crosslinking reaction rate constant; Reaction time; the reaction temperature; Water-based polyurethane-acrylic ester copolymer; heat sealing strength improvement rate ) The formula: ; Wherein, the Heat seal strength of uncrosslinked system; The strength of heat-seal after crosslinking, , PEGDA in parts by weight; heat sealing temperature reduction value [ ] ) The formula: ; Wherein, the PEGDA in parts by weight; resin weight portions; a degree of crosslinking; and the optimization effect of PEGDA on the heat sealing temperature is quantified, and meanwhile, the influence of the crosslinking degree on the temperature is balanced, so that the low-temperature heat sealing and the high strength are ensured.
  7. 7. The method for inhibiting thermal runaway of the aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptation algorithm of the co-doping and uniform dispersion of the multifunctional auxiliary agent in S5 is composed of the following formula: combustion inhibition grade improvement ) The formula: ; Wherein, the Flame suppression rating of the flame-retardant system; Microcapsule red phosphorus in parts by weight; Red phosphorus coating rate; Aluminum hydroxide in parts by weight; the final grade is converted according to UL94 standard; toxic gas emission reduction rate ) The formula: ; Wherein, the 1010 Parts of antioxidant; Nano zinc oxide in parts by weight; 、 The emission reduction coefficients of the two auxiliary agents are respectively, and 0.7 is the maximum synergistic coefficient; Antibacterial rate% ) The formula: ; Wherein, the Nano zinc oxide in parts by weight; The dispersion uniformity of the nano zinc oxide.
  8. 8. The method for inhibiting thermal runaway of aerogel heat sealing film based on phase change material blending according to claim 2, wherein the adaptation algorithm of gradient curing film formation and hydrophobic post-treatment in S6 is composed of the following formula: Curing completeness [ ] ) The formula: ; Wherein, the The temperature of the first stage is set to be the same as the temperature of the second stage, Time; the temperature of the second stage is set to be the same as the temperature of the first stage, Time; The temperature of the third stage is set to be the same as the temperature of the first stage, Time; The temperature of the conventional single cure is set, Conventional cure times; Hydrophobic property improvement rate [ ] ) The formula: ; Wherein, the A water contact angle of the membrane material which is not subjected to hydrophobic treatment; The contact angle after the water repellency, , The weight portions of the hydrophobic modifier are that, Baking time; the addition amount and the baking time of the hydrophobic modifier are related, the formation of a hydrophobic layer on the surface is precisely controlled, and the water resistance is improved; Durability retention [ ] ) The formula: ; Wherein, the Curing completeness; The rate of increase of the hydrophobic property.

Description

Aerogel heat-sealing film based on phase change material blending and thermal runaway inhibition method thereof Technical Field The invention belongs to the technical field of aerogel heat-sealing films, and particularly relates to an aerogel heat-sealing film based on phase change material blending and a thermal runaway inhibition method thereof. Background The aerogel heat-sealing film is a composite functional material which integrates aerogel porous heat-insulating property, phase-change material energy storage function and heat-sealing film forming property, the core of the aerogel heat-sealing film is to construct a low heat-conducting framework through aerogel, the phase-change material provides temperature regulation and control capability, a heat-sealing system guarantees material forming and application suitability, the aerogel heat-sealing film becomes a key material for solving the multi-scene temperature runaway and sealing protection requirements by virtue of the integral advantages of heat insulation, energy storage and sealing, and is gradually and widely focused in the fields of new energy, construction, electronics, cold chains and the like, and performance optimization and function upgrading of the aerogel heat-sealing film becomes one of research hotspots in the material field. The material has irreplaceable effects in multiple fields, can delay thermal runaway spreading through double effects of heat insulation and energy storage in a new energy battery pack, improves the use safety of batteries, can realize dynamic adjustment of indoor temperature in the field of building heat preservation, reduces energy consumption of an air conditioner, helps power and energy conservation building development, can avoid damage of a high-temperature environment to core components such as chips and the like in electronic device packaging, prolongs the service life of equipment, can maintain a constant-temperature environment in packaging in the field of cold chain packaging, reduces temperature fluctuation in the cold chain transportation process, ensures the quality stability of fresh products, medicines and the like, and further has good heat sealability so that the material is suitable for various packaging processes, and further expands the coverage range of application scenes. In the prior environment, the related technology of the aerogel heat-sealing film still has obvious bottlenecks that on one hand, the compatibility of a single aerogel carrier and a phase change material is poor, aggregation phenomenon is easy to occur, a single phase change system heat storage temperature interval is narrow, an inorganic phase change material is easy to leak, heat storage efficiency and stability are insufficient, meanwhile, the traditional material adopts single heat insulation or single flame retardant design, heat conduction blocking and combustion inhibition cooperativity are poor, and double risks of temperature rising and flame spreading in a thermal runaway process are difficult to deal with. On the other hand, the film forming system has inherent contradiction between crosslinking reaction and heat sealing performance, the film forming system has loose structure, easily-moved components and increased film embrittlement and heat sealing difficulty due to insufficient crosslinking, most of curing processes are single-temperature treatment, uneven curing is easy to occur, the finished product has poor water resistance, the function attenuation is fast under complex environments such as high-low temperature circulation and the like, and the durability is difficult to meet the actual application demands. Therefore, the invention provides an aerogel heat-sealing film based on phase change material blending and a thermal runaway inhibition method thereof. Disclosure of Invention In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved. The technical scheme adopted for solving the technical problems is that the aerogel heat-sealing film based on phase change material blending is characterized by being composed of the following materials: Composite aerogel carrier: main aerogel, hydrophobically modified 6-10 Parts of aerogel; 2-4 parts of reinforced aerogel, namely nitrogen-doped graphene aerogel; 0.3-0.8 part of modifier gamma-aminopropyl triethoxysilane; 15-25 parts of dispersion medium, namely absolute ethyl alcohol; Biphase transformation synergistic system: 30-45 parts of branched-chain behenate; 10-18 parts of modified calcium chloride hexahydrate; 8-12 parts of microcapsule coating agent, namely polyurea-melamine formaldehyde copolymer; Heat sealing film forming synergistic system: 25-35 parts of base film resin, namely aqueous polyurethane-acrylic ester copolymer; 1-3 parts of heat sealing promoter, namely polyethylene glycol diacrylate; 2-5 parts of an anti-migration agent, namely organic bentonite; 0.5-1.2 parts of cross-linki