A battery-based heat dissipation insulating paint and its spraying process

Abstract

The present invention discloses a battery-based heat-dissipating insulating varnish and its spraying process, relating to the technical field of heat-dissipating insulating varnishes. The battery-based heat-dissipating insulating varnish is prepared from the following components: 4,4'-methylenebis(N,N-diglycidylaniline), 4,4'-sulfonyldianiline, and epoxy-functionalized composite microspheres; the epoxy-functionalized composite microspheres are prepared from insulating-treated composite microspheres and γ-(2,3-epoxypropoxy)propyltrimethoxysilane. The spraying process is an electrostatic spraying process, and the electrostatic spraying process parameters include: atomizing pressure: 0.3-0.5MPa, gun travel speed: 0.5-1.2m / s, ambient humidity: ≤60%RH, spray thickness: 50-200μm, curing temperature: 180-185°C, and curing time: 3-3.5h.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation insulating paint, in particular to a battery-based heat dissipation insulating paint and a spraying process thereof. Background Art

[0002] Existing technologies, such as increasing heat dissipation area or replacing materials (e.g., copper instead of aluminum) to improve heat dissipation efficiency, often result in increased size and weight, exacerbating energy consumption and operational stability issues. While heat pipes can rapidly conduct heat, they carry the risk of failure after thermal equilibrium. In the field of insulating coatings, the high VOC pollution of traditional solvent-based coatings, the inadequate overall performance of water-based paints (such as salt spray resistance and mechanical defects), and the partial discharge caused by the loose fit between insulating paper and battery casings highlight the urgent need to develop new heat-dissipating insulation materials.

[0003] Therefore, it is of great significance to invent a battery-based heat dissipation insulating paint and a spraying process thereof. Summary of the Invention

[0004] The object of the present invention is to provide a battery-based heat-dissipating insulating paint and a spraying process thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A battery-based heat-dissipating insulating paint is prepared from the following components: 4,4'-methylenebis(N,N-diglycidylaniline), 4,4'-sulfonyl dianiline, and epoxy-functionalized composite microspheres;

[0007] Furthermore, the epoxy functionalized composite microspheres are prepared from insulating treated composite microspheres and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0008] Furthermore, the alumina particles have a particle size of 5-6 μm;

[0009] Furthermore, the epoxy resin is bisphenol A type, model number is YD-128;

[0010] Furthermore, the polystyrene model is PG-383;

[0011] Furthermore, the preparation method of the battery-based heat dissipation insulating paint comprises the following steps: uniformly mixing 4,4'-methylenebis(N,N-diglycidylaniline) and epoxy-functionalized composite microspheres, adding 4,4'-sulfonyl dianiline, heating to 150-155°C, stirring uniformly, and vacuum degassing to obtain the battery-based heat dissipation insulating paint;

[0012] Furthermore, in the preparation process of the battery-based heat dissipation insulating paint, the mass ratio of 4,4'-methylenebis(N,N-diglycidylaniline):4,4'-sulfonyldianiline:epoxy functionalized composite microspheres is 1:0.6:(0.15-0.3).

[0013] Furthermore, the preparation method of the epoxy-functionalized composite microspheres includes the following steps: adding the insulating-treated composite microspheres to deionized water, ultrasonically dispersing, adding methanol and γ-(2,3-epoxypropoxy)propyltrimethoxysilane, adjusting the pH of the reaction system to 3.0 with acetic acid, heating to 55-57° C. for a reaction of 6-6.5 hours, filtering, washing the product with deionized water, and freeze-drying to obtain the epoxy-functionalized composite microspheres;

[0014] Furthermore, during the preparation of the epoxy-functionalized composite microspheres, the mass ratio of the insulating composite microspheres to γ-(2,3-epoxypropoxy)propyltrimethoxysilane is 10:(1-1.5).

[0015] Furthermore, the preparation method of the insulating composite microspheres includes the following steps: adding the composite microspheres to an ethanol-water solution with a volume ratio of 10:1, ultrasonically dispersing, adding ammonium hydroxide and hexadecyltrimethylammonium bromide, ultrasonically dispersing, adding tetraethyl orthosilicate and 3-methacryloyloxypropyltrimethoxysilane, hydrolyzing and condensing for 8-9 hours, centrifuging, washing the product alternately with ethanol and deionized water, and vacuum drying at 60-65° C. to obtain the insulating composite microspheres;

[0016] Furthermore, in the preparation process of the insulating treated composite microspheres, the proportions of each component, calculated by mass, include: 0.1-0.15 parts of composite microspheres, 9-10 parts of ammonium hydroxide, 0.015-0.02 parts of hexadecyltrimethylammonium bromide, 5-6 parts of tetraethyl orthosilicate, and 5-6 parts of 3-methacryloyloxypropyltrimethoxysilane; wherein the mass ratio of tetraethyl orthosilicate to 3-methacryloyloxypropyltrimethoxysilane is 1:1.

[0017] Furthermore, the preparation method of the composite microspheres includes the following steps: adding epoxy resin to 80-85°C deionized water, adding sodium lauryl sulfate, stirring evenly, adding composite polymer particles, stirring evenly, heating to 120-125°C and reflux reaction for 24 hours, adding polyetheramine curing agent and carbon nanotube-boron nitride nanosheet composite material, stirring at this temperature for 2-3 hours, centrifuging, washing the product, and freeze-drying to obtain composite microspheres;

[0018] Furthermore, the proportions of the components in the preparation process of the composite microspheres are calculated by mass and include: 8-10 parts of epoxy resin, 0.005-0.006 parts of sodium lauryl sulfate, 0.5-1 parts of composite polymer particles, 5-6 parts of polyetheramine curing agent, and 1-2 parts of carbon nanotube-boron nitride nanosheet composite material.

[0019] Furthermore, the preparation method of the composite polymer particles comprises the following steps: adding alumina particles and multi-walled carbon nanotubes to polystyrene, heating to 190-195° C. for melt blending, grinding and screening the mixed product to obtain composite polymer particles;

[0020] Furthermore, in the preparation process of the composite polymer particles, the proportions of the components, calculated by mass percentage, include: 0.5-0.8 wt % of aluminum oxide particles, 0.5-1.0 wt % of multi-walled carbon nanotubes, and the remainder being polystyrene.

[0021] Furthermore, the preparation method of the carbon nanotube-boron nitride nanosheet composite material comprises the following steps: adding boron nitride nanosheets and nickel acetate to isopropyl alcohol, ultrasonically dispersing for 6-7 hours, magnetically stirring for 12-13 hours, and rotary evaporating at 60-65° C. to obtain a nickel salt-boron nitride nanosheet precursor; placing the nickel salt-boron nitride nanosheet precursor in a fluidized bed reactor for reduction and carbon nanotube growth, and cooling to room temperature to obtain a carbon nanotube-boron nitride nanosheet composite material;

[0022] Furthermore, the boron nitride nanosheets are prepared by a supercritical carbon dioxide exfoliation method.

[0023] Furthermore, the reduction process parameters include: temperature of 500-505° C., gas flow of argon-hydrogen mixed gas, argon flow rate of 300-305 sccm, hydrogen flow rate of 30-31 sscm, and reaction time of 10-10.5 min.

[0024] Furthermore, the carbon nanotube growth process parameters include: temperature of 660-665° C., gas flow of ethylene, ethylene flow rate of 30-30.5 sscm, and reaction time of 5-15 min.

[0025] A spraying process for battery-based heat-dissipating insulating paint, wherein the spraying process is an electrostatic spraying process, and the electrostatic spraying process parameters include: atomizing air pressure: 0.3-0.5MPa, gun speed: 0.5-1.2m / s, ambient humidity: ≤60%RH, spraying thickness: 50-200μm, curing temperature: 180-185℃, and curing time: 3-3.5h.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The composite microspheres in this invention are based on a polystyrene matrix, with alumina and multi-walled carbon nanotubes dispersed within, and coated with carbon nanotube-boron nitride nanosheets. The alumina and multi-walled carbon nanotubes form a synergistic thermal conductivity path within the matrix, while the carbon nanotube-boron nitride nanosheets are electrostatically sprayed to form a continuous outer network, further reducing interfacial thermal resistance. Furthermore, the carbon nanotube-boron nitride nanosheets connect the thermal conductivity paths between different composite microspheres, further improving thermal conductivity efficiency. The carbon nanotubes act as "bridges" connecting the carbon nanotube-boron nitride nanosheets, forming a three-dimensional thermal conductivity network throughout the coating. The microsphere surfaces are functionalized with γ-(2,3-epoxypropoxy)propyltrimethoxysilane to enhance the interfacial bonding between the carbon nanotube-boron nitride nanosheets and the epoxy resin, reducing phonon scattering.

[0028] 2. Through the hydrolysis and condensation reaction of ethyl orthosilicate and 3-methacryloxypropyltrimethoxysilane, a dense SiO2 insulating layer is formed on the surface of the microspheres, and the exposed carbon nanotubes in the carbon nanotube-boron nitride nanosheet structure are insulated, effectively improving the insulation performance without affecting the thermal conductivity.

[0029] 3. This invention successfully solves the industry challenge of achieving a synergistic improvement in both high thermal conductivity and electrical insulation through the innovative design of a composite microsphere structure and an electrostatic spraying process. Its core mechanisms include: (1) the construction of a synergistic thermal conductivity network between the inner and outer fillers; (2) the insulating barrier effect of the carbon nanotube-boron nitride nanosheets and the chemically bonded interface; and (3) uniform dispersion and orientation control driven by the spraying process. The resulting heat-dissipating insulating varnish possesses both excellent mechanical strength and thermal stability, and has broad application prospects in power batteries, high-power LEDs, and other fields. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the following examples, a method for preparing a carbon nanotube-boron nitride nanosheet composite material comprises the following steps: adding 1 g of boron nitride nanosheets and 1 g of nickel acetate to isopropyl alcohol, ultrasonically dispersing for 6 hours, magnetically stirring for 12 hours, and rotary evaporating at 60° C. to obtain a nickel salt-boron nitride nanosheet precursor; placing the nickel salt-boron nitride nanosheet precursor in a fluidized bed reactor for reduction and carbon nanotube growth, and cooling to room temperature to obtain a carbon nanotube-boron nitride nanosheet composite material;

[0032] The reduction process parameters include: temperature of 500° C., gas flow of argon-hydrogen mixed gas, argon flow rate of 300 sccm, hydrogen flow rate of 30 sscm, and reaction time of 10 min.

[0033] The parameters of the carbon nanotube growth process include: temperature of 660° C., gas flow of ethylene, ethylene flow rate of 30 sscm, and reaction time of 5 min.

[0034] The preparation method of composite polymer particles comprises the following steps: adding 0.5g of aluminum oxide particles and 1.0g of multi-walled carbon nanotubes to 98.5g of polystyrene, heating to 190°C for melt blending, grinding and screening the mixed product to obtain composite polymer particles.

[0035] Example 1: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 0.5 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 1 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0036] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0037] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0038] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0039] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0040] Example 2: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 1 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 1 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0041] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0042] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0043] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0044] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0045] Example 3: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 1 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 2 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0046] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0047] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0048] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0049] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0050] Example 4: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 1 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 2 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0051] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0052] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0053] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 3 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0054] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0055] Comparative Example 1: A spraying process for a heat-dissipating insulating paint based on a battery: S1: 10 g of epoxy resin was added to 80°C deionized water, 0.006 g of sodium lauryl sulfate was added, and the mixture was stirred evenly. The mixture was heated to 120°C and refluxed for 24 h. 5 g of a polyetheramine curing agent and 1 g of a carbon nanotube-boron nitride nanosheet composite material were added, the mixture was stirred at this temperature for 2 h, centrifuged, the product was washed, and freeze-dried to obtain composite microspheres.

[0056] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0057] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0058] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0059] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0060] Comparative Example 2: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 0.5 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 1 g of boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0061] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0062] S3: 10 g of insulating treated composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0063] S4: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint;

[0064] S5: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0065] Comparative Example 3: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 0.5 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 1 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0066] S2: 10 g of composite microspheres were added to deionized water and ultrasonically dispersed. 1 g of methanol and 1 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane were added. The pH of the reaction system was adjusted to 3.0 with acetic acid. The reaction was heated to 55 °C for 6 h, filtered, and the product was washed with deionized water and freeze-dried to obtain epoxy-functionalized composite microspheres.

[0067] S3: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of epoxy-functionalized composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a battery-based heat dissipation insulating paint.

[0068] S4: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0069] Comparative Example 4: A spraying process for a heat-dissipating insulating paint based on a battery: S1: Add 10 g of epoxy resin to 80°C deionized water, add 0.006 g of sodium lauryl sulfate, stir evenly, add 0.5 g of composite polymer particles, stir evenly, heat to 120°C and reflux for 24 h, add 5 g of polyetheramine curing agent and 1 g of carbon nanotube-boron nitride nanosheet composite material, keep warm and stir for 2 h, centrifuge, wash the product, and freeze-dry to obtain composite microspheres;

[0070] S2: 0.1 g of composite microspheres were added to an ethanol-water solution with a volume ratio of 10:1, and ultrasonic dispersion was performed. 9 g of ammonium hydroxide and 0.015 g of hexadecyltrimethylammonium bromide were added, and ultrasonic dispersion was performed. 5 g of ethyl orthosilicate and 5 g of 3-methacryloyloxypropyltrimethoxysilane were added, and hydrolysis and condensation reaction was carried out for 8 h. The product was centrifuged and washed alternately with ethanol and deionized water, and dried in vacuo at 60°C to obtain insulating composite microspheres.

[0071] S3: 10 g of 4,4'-methylenebis(N,N-diglycidylaniline) and 1.5 g of insulating treated composite microspheres were mixed evenly, 6 g of 4,4'-sulfonyldianiline was added, and the mixture was heated to 150°C, stirred evenly, and vacuum degassed to obtain a heat dissipating insulating paint based on a battery;

[0072] S4: Electrostatic spraying process is adopted. The electrostatic spraying process parameters include: atomizing air pressure: 0.3MPa, gun speed: 0.8m / s, ambient humidity: ≤60%RH, spraying thickness: 100μm, curing temperature: 180℃, and curing time: 3h.

[0073] Experiment: Dielectric performance test: According to ASTM D257 standard, use a high resistivity meter to measure the resistivity value of heat dissipation insulation paint

[0074] Thermal conductivity test: Use a thermal conductivity meter to measure the thermal conductivity of heat dissipation insulation paint.

[0075] According to λ=α×ρ×C p ;

[0076] Among them, λ (W / mK) thermal conductivity, α (mm 2 / s) thermal diffusivity, ρ (g / cm 3 ) density, C p (J / g / K) specific heat capacity.

[0077] The experimental results are shown in Table 1 below.

[0078] Table 1. Test data of heat dissipation insulation paint performance based on battery

[0079]

[0080] Conclusion: The heat dissipation insulating paint prepared by the present invention has excellent thermal conductivity and insulation performance.

[0081] Comparative Example 1 does not contain composite polymer particles, resulting in a decrease in thermal conductivity; Comparative Example 2 uses ordinary boron nitride nanosheets, resulting in a decrease in thermal conductivity; Comparative Example 3 does not perform insulation treatment, resulting in a decrease in insulation performance; Comparative Example 4 does not perform epoxy functionalization treatment, resulting in a decrease in thermal conductivity.

[0082] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A battery-based heat dissipation insulating paint, characterized in that: The battery-based heat dissipation insulating paint is prepared from the following components, including 4,4'-methylenebis(N,N-diglycidylaniline), 4,4'-sulfonyldianiline, and epoxy-functionalized composite microspheres; The preparation method of the battery-based heat-dissipating insulating paint comprises the following steps: uniformly mixing 4,4'-methylenebis(N,N-diglycidylaniline) and epoxy-functionalized composite microspheres, adding 4,4'-sulfonyl dianiline, heating to 150-155°C, stirring uniformly, and vacuum degassing to obtain the battery-based heat-dissipating insulating paint; In the preparation process of the heat dissipation insulating paint based on the battery, the mass ratio of 4,4'-methylenebis(N,N-diglycidylaniline):4,4'-sulfonyldianiline:epoxy functionalized composite microspheres is 1:0.6:(0.15-0.3); The preparation method of the epoxy-functionalized composite microspheres comprises the following steps: adding the insulating-treated composite microspheres to deionized water, performing ultrasonic dispersion, adding methanol and γ-(2,3-epoxypropoxy)propyltrimethoxysilane, adjusting the pH of the reaction system to 3.0 with acetic acid, heating to 55-57° C. for reaction for 6-6.5 hours, filtering, washing the product with deionized water, and freeze-drying to obtain the epoxy-functionalized composite microspheres; During the preparation of epoxy-functionalized composite microspheres, the mass ratio of insulating-treated composite microspheres to γ-(2,3-epoxypropoxy)propyltrimethoxysilane was 10:(1-1.5); The method for preparing insulating composite microspheres comprises the following steps: adding the composite microspheres to an ethanol-water solution with a volume ratio of 10:1, ultrasonically dispersing the composite microspheres, adding ammonium hydroxide and hexadecyltrimethylammonium bromide, ultrasonically dispersing the composite microspheres, adding tetraethyl orthosilicate and 3-methacryloyloxypropyltrimethoxysilane, carrying out a hydrolysis-condensation reaction for 8-9 hours, centrifuging the product, washing the product alternately with ethanol and deionized water, and vacuum drying the product at 60-65° C. to obtain the insulating composite microspheres; The preparation method of the composite microspheres comprises the following steps: adding epoxy resin to deionized water at 80-85°C, adding sodium lauryl sulfate, stirring evenly, adding composite polymer particles, stirring evenly, heating to 120-125°C and reflux reaction for 24 hours, adding polyetheramine curing agent and carbon nanotube-boron nitride nanosheet composite material, keeping the temperature and stirring for 2-3 hours, centrifuging, washing the product, and freeze-drying to obtain the composite microspheres; The preparation method of the composite polymer particles comprises the following steps: adding alumina particles and multi-walled carbon nanotubes to polystyrene, heating to 190-195° C. for melt blending, and grinding and screening the mixed product to obtain composite polymer particles; The preparation method of the carbon nanotube-boron nitride nanosheet composite material comprises the following steps: adding boron nitride nanosheets and nickel acetate to isopropyl alcohol, ultrasonically dispersing for 6-7 hours, magnetically stirring for 12-13 hours, and rotary evaporating at 60-65°C to obtain a nickel salt-boron nitride nanosheet precursor; placing the nickel salt-boron nitride nanosheet precursor in a fluidized bed reactor for reduction and carbon nanotube growth, and cooling to room temperature to obtain the carbon nanotube-boron nitride nanosheet composite material.

2. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The proportions of each component in the preparation process of the insulating treated composite microspheres are calculated by mass and include: 0.1-0.15 parts of composite microspheres, 9-10 parts of ammonium hydroxide, 0.015-0.02 parts of hexadecyltrimethylammonium bromide, 5-6 parts of tetraethyl orthosilicate, and 5-6 parts of 3-methacryloyloxypropyltrimethoxysilane; among which, the mass ratio of tetraethyl orthosilicate to 3-methacryloyloxypropyltrimethoxysilane is 1:

1.

3. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The proportions of the components in the preparation process of the composite microspheres are calculated by mass and include: 8-10 parts of epoxy resin, 0.005-0.006 parts of sodium lauryl sulfate, 0.5-1 parts of composite polymer particles, 5-6 parts of polyetheramine curing agent, and 1-2 parts of carbon nanotube-boron nitride nanosheet composite material.

4. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The components in the preparation process of the composite polymer particles are calculated by weight and include: 0.5-0.8wt% of aluminum oxide particles, 0.5-1.0wt% of multi-walled carbon nanotubes, and the rest being polystyrene.

5. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The boron nitride nanosheets are prepared by a supercritical carbon dioxide exfoliation method.

6. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The reduction process parameters include: temperature of 500-505° C., gas flow of argon-hydrogen mixed gas, argon flow rate of 300-305 sccm, hydrogen flow rate of 30-31 sscm, and reaction time of 10-10.5 min.

7. The battery-based heat dissipation insulating paint according to claim 1, characterized in that: The carbon nanotube growth process parameters include: temperature of 660-665° C., ethylene gas flow, ethylene flow rate of 30-30.5 sscm, and reaction time of 5-15 min.

8. A spraying process for heat dissipation insulating paint based on a battery according to any one of claims 1 to 7, characterized in that: The spraying process is an electrostatic spraying process, and the electrostatic spraying process parameters include: atomizing air pressure: 0.3-0.5MPa, gun speed: 0.5-1.2m / s, ambient humidity: ≤60%RH, spraying thickness: 50-200μm, curing temperature: 180-185℃, and curing time 3-3.5h.

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